[TheThinkTank] bikes on display

We at the Elyria (Ohio) Bicycle Education Center are pretty new to much of how to run a coop and shop. We appreciate the collective intelligence being shared here.

We are looking for a good and inexpensive way to display bikes in our front 'sales room' without relying on kickstands to hold up the bikes (some have'em, some don't).

Willing to build wood racks or whatever but have not seen anything reasonable yet.

Any suggestions?