Instead of a clear plastic pot how about making a pot out of a clear food container. At any grocery that has a deli counter you could get a tall 5 inch clear plastic food container with a lid. Probably have to buy something. You can easily punch a few holes around the base of the "pot" and there you have it!
You may also check out a local Smart & Final and see if they carry anything you could adapt. I've gotten some nice quart styrafoam cups that make great inexpensive pots.