Save a few bucks, and do yourself and the landfill a favor. Save that yogurt cup. Instead of spending your hard earned cash on small single plant sized pots, just make a simple alteration and you are good to go.
I found Go Cups from KFC actually are great to make a mini greenhouse. They actually have one hole in the clear domed lid already but you can add more if you choose. The bottom section is divided so you can plant two different types of seeds and they will stay separate. Any container that you can recycle both saves money and the landfills. Win, win!!