Track down manuals and original cartons. Clean or dust and test everything. A handy shopper may know how to fix it. Handmade items are popular. If you have the time and the creativity, make crafts to sell or whip up a tempting assortment of baked goodies.
Older children can run a beverage and baked goods concession.
Get the word out by advertising in your local newspapers. Invite friends and family to help make brightly colored cardboard signs in a couple of sizes. Print the day, date, time and address, along with a general description of the types of items for sale, such as kitchen gadgets, hand tools, or books. Specify any specialty items, for example, Wedgwood collection or kids' clothes size 4T-6X. Place signs on bulletin boards in supermarkets, laundromats, churches, community centers, and train stations. The day before the sale, post signs around town.