Make a display stand youself...it is easy. For the base go to your local craft store and buy a pre-cut piece of wood, these are usually used for wall plaques, and come in a variety of different sizes and shapes, but usually need to be stained or painted. For the stand there a couple of ways to go. First, the easiest way to go is to use coated clothes wire hanger cut to length. Drill a hole in the base and super glue or epoxy one end of the wire in the hole, then gentle bend the wire for the aircraft position you want. Usually there is some kind of hole or other opening in the aircraft that the end of the wire can be inserted into. The trick is to leave youself enough wire(leave more than you think you will need, you can cut it off later) to work up into the aircraft. You may need to bend the wire a little bit in order for it to hold the aircraft at the right angle, just play with it untill it is right. Another way to do it is to use the same base set up, but instead of the wire use acrylic rod or a wooded dowel. What I do is use a 1/8" phono jack(available at you local electronics store) and build the female part right into the model that will be displayed. The male part is married into the acrylic rod or wooded dowel. This works great, because the model can be easly removed and reattached at will.
A good source for acrylic rod is: WWW.TAPPLASTICS.COM