For those of you looking for 3-gallon cornies, there's two of them going for $90 (for the pair) in an auction that closes a little after midnight... it'll probably get expensive at the end, but might be worth watching... reconditioned, ball-lock... not mine, I just happened to notice them and know that lots of people are on the lookout for them (and $90 is going price for one, much less two, of them).
http://cgi.ebay.com/Pair-of-3-Gallon-Cornelius-Soda-Kegs-Homebrew-Beer-Keg_W0QQitemZ230109715672QQcategoryZ38172QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Pair-of-3-Gallon-Cornelius-Soda-Kegs-Homebrew-Beer-Keg_W0QQitemZ230109715672QQcategoryZ38172QQrdZ1QQcmdZViewItem