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Do you mean a DIY, or someone who sells a complete setup? For full setups, petwarehouse.com had some pretty decent deals. For a DIY, on a lower-scale, I've built one using the yeast-sugar-water method and it works rather well, it's only drawback is having to re-mix the yeast-mix once in awhile, but it generates pretty decent Co2 output.
If your interested in that, I will get the link from my gf, as I've seem to have lost the plans for it..or I can describe howto build it, it is rather simple.
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