craftgrrl | Button Making Question!

So, I just discovered this gem of a community today, and I was wondering if you all could help me with finding a button machine to use. I'm thinking about selling some next year at an anime convention, but I doubt I'll make much of a profit if any so I'd like it to be fairly inexpensive.

I found this older post here that seemed helpful and I went onto Dr. Don's site but are those machines still the best ones to get and where can I get the best prices for them?

Any help would be greatly appreciated! :D Thank you very much.