Create aisles with storage-related products in attractive displays. Hang items nicely on the walls. Don't allow customers to walk into the office and straight to the counter. Make them walk through the aisles, tempting them to buy something. Make your office a retail store for storage-related materials.
People naturally gravitate toward the discount items.
If you can buy them right, you'll still be able to get a 100 percent markup on them. Take the retail price and mark through it with a thick red marker and replace it with the discounted price. Many people will search through this discount bin to buy things, unaware that your margins on these items are as high as on anything else in the store. When people find out you have great products at great prices in your bin, they'll come back every time they're at the facility. Your chances for selling them something will be dramatically increased.