+1. Totally awesome to work with and fast shipping. Be prepared to clean the crap out of the kegs and go ahead and do yourself a favor and get some extra poppets while you are at it.
Also, go to McMaster.com and get this:
9452K218 1 Pack Buna-n O-ring, As568a Dash Number 417
74695A58 12 Each Bayonet Mixer Nozzle, 5.3"l, 1/4" Blunt Tip
9452K172 1 Pack Buna-n O-ring, As568a Dash Number 109
9452K23 1 Pack Buna-n O-ring, As568a Dash Number 111
Those are all the O rings you will need for the posts (100 for like $2), dip tubes (100 for like $2) and lids (10 for $12) for not to mention the super sweet bayonet twisty things ($1 each when you order 12 or more) that provides resistance to prevent foaming up. Take them out of the tubes they come in and slide them right into your liquid side dip tube for extra insurance against foaming up.
Kegcowboy.com has some good deals too but the price at kegconnection.com is REALLY hard to beat and their customer service is second to none in my opinion.
Enjoy!
Dean