Question: What is the median size of a store in what was once Pay 'n Save's membership discount chain?

Context paragraphs:
Pay 'n Save: Pay 'n Save was a retail company founded by Monte Lafayette Bean in Seattle, Washington; 1940.  Over the years, Pay 'n Save was the leading drugstore chain in Washington and was the owner of several Washington-based retailers including Lamonts and Ernst.  A 1984 sale of the company to The Trump Group and a 1986 attempt to transform the retailer into a bargain-basement merchandiser resulted in a loss of nearly $50 million.  By 1988, Pay 'n Save was sold to Thrifty Corporation who later sold the stores to PayLess Drug who retired the Pay 'n Save name.  As a result, most of the retailer's divisions were spun off as separate companies or shuttered.  As of 2011, Pay 'n Save's membership discount chain, Bi-Mart, is the lone surviving division of the company (as of 2017, Bi-Mart is an employee-owned company).

Shop 'n Save (Pittsburgh): SHOP 'n SAVE is a locally owned and operated grocery store chain with 90 supermarket locations within Western Pennsylvania, Western New York, Eastern Ohio, Western Maryland and West Virginia.  Established in 1968 as one of the nation's first discount grocery stores, SHOP 'n SAVE offers name-brand and private label products.  The stores are supplied by the distributor SuperValu.

Pak'nSave: Pak'nSave (stylised PAK'nSAVE, originally PAK 'N SAVE) is a New Zealand discount food warehouse chain owned by the Foodstuffs cooperative.

Ernst Home Centers: Ernst Home Centers, Inc. was a chain of home improvement retail stores founded in Seattle, Washington, United States.  Ernst was started in 1893 by Seattle brothers Charles and Fred Ernst and in 1960 became a division of Pay 'n Save, one of the largest retail companies in the Northwest.  After a 1984 takeover of Pay 'n Save, Ernst was sold off and went public in 1994.  Following several highly publicized lawsuits and a failed attempt to open larger stores, the company filed for Chapter 11 bankruptcy in 1996 and liquidated in early 1997.  At the company's peak, it operated 95 stores in 12 western U.S. states.

G. O. Guy: G.O. Guy was a small chain of drugstores located in the Seattle area of the U.S. state of Washington.  The chain was founded in 1888 by George Omar Guy.  Throughout the early 20th century, G.O. Guy's was the second largest drug store chain in Seattle behind Bartell Drugs and predated it by two years.  In 1987 Pay 'n Save purchased all six locations and converted most of them to Pay 'n Save express stores, slightly smaller than full service stores.  Pay 'n Save was bought by Thrifty PayLess which in turn was bought by Rite Aid.

Clemens Markets: Clemens Markets also known as Clemens Family Markets was a supermarket chain in the Philadelphia area.  It was family-owned from the founding of its first store in Lansdale, Pennsylvania to the sale of the company in 2006.  Clemens was one of three independent supermarket chains to identify as "family markets" in Greater Philadelphia.  Another was Genuardi's, which was sold to Safeway Inc. in 2000.  The last one was Giunta's, which went out of business soon after Clemens.  During the 1980s and 1990s, Clemens expanded by opening many new locations; eventually Clemens operated 20 supermarkets in three Pennsylvania counties, moving its headquarters to Kulpsville, Pennsylvania in 1993.  The chain eventually acquired many Thriftway/Shop 'n Bag franchises.  Many of these were also former Acme, A&P, Food Fair, and Penn Fruit stores.  Clemens later acquired many former Shop 'n Save stores which themselves started as Super G.  In 1999, it introduced its upscale FoodSource division, which had three locations.  One of these stores was a former Zagara's, a gourmet supermarket chain itself a division of Genuardi's and later Safeway.

Pay 'n Pak: Pay 'n Pak was a home improvement chain that was based out of Kent, Washington.  Pay 'n Pak began in 1962 and was founded by Stan Thurman, an electric and plumbing supply retailer from Longview, Washington.  In 1969 Pay 'n Pak merged with Eagle Electric & Plumbing, a company run by Thurman protégé David Heerensperger.  Shortly thereafter, Stan Thurman was voted out and Heerensperger became the chairman of the company until 1989 when he left to form Eagle Hardware & Garden.  At the time of a hostile corporate raid attempt in 1987, Pay 'n Pak had 112 stores in the Western United States.

Foodland Hawaii: "Foodland" (Full name Foodland Super Market, Ltd.) is an American supermarket chain, headquartered in Honolulu, Hawaii.  Foodland operates 32 stores throughout the state of Hawaii under the "Foodland," "Foodland Farms," and "Sack 'N Save" names.  "Food, Family & Friends" is their current slogan.  The chain is in the process of adding more locations in Hawaii.  The chain serves as the flagship of the Sullivan Family of Companies.

Bi-Mart: Bi-Mart is an employee-owned chain of retailers located in the U.S. states of Oregon, Washington, and Idaho.  A typical Bi-Mart houses merchandise including electronics and small appliances, housewares, hardware and power tools, sporting and hunting supplies, apparel, canned and packaged food, personal care products, a drugstore and pharmacy.  The median size of a Bi-Mart store is 31000 sqft .

Lamonts: Lamonts was a chain of department stores founded in Seattle, Washington.  The chain was started in 1970 when Pay 'n Save renamed its suburban branches of Rhodes, a department store chain the company acquired in 1965.  Lamonts remained a division of Pay 'n Save until 1985.  During the 1990s, the chain filed for bankruptcy twice and closed several stores before being sold to Gottschalks in 2000.  Gottschalks itself went into bankruptcy and liquidated in 2009.

Supporting paragraphs: Pay 'n Save Bi-Mart
Answer: 31000 sqft