Ubbi diaper pail is awesome!!!!
No special bags to buy, no smell at ALL. I tried a few different ones and this one was worth it. It's powder coated steel, fully sealed with rubber gaskets. No odor can escape!
I have an extra one in white. Used, but I can send it to you. I have it listed on craigslist: http://sfbay.craigslist.org/eby/bab/3534682251.html
Also, when baby grows up, it will still be a great trash can. PM me if you're interested.