I'm psyched... I got a pretty awesome deal on four ball locks recently through homebrewing.org, and today I picked up a 15lb tank with regulator for $25!
My only complaint is that the tank is so big I can't fit it into my yet-to-be-build kegerator, but it's a nice problem to have, since I probably saved a hundred bucks on the tank alone, based on the prices quoted from my local gas suppliers.
SWMBO gets back from a trip late tonight... I'm hoping I can convince her to okay dumping the "saved" money into an upgraded kegerator/keezer build.