I'm just getting into kegging and one of the guys in my local homebrew club pointed me to this website for buying CO2 tanks, regulators, parts, etc. The prices are much better than my local welding supply shop and since they have multiple distribution points across the country, deliveries are pretty quick. I ordered yesterday and should receive my tank by Friday.
Uff Da Picobrewery
Primary: Saison with WLP670,
Kegged: Celebration Ale Clone (with homegrown hops), Blackened IPA Lucky Hart Farmhouse Ale, Jarl Pils (Noble Pils Clone), Yuletide CarØl
Bottled: Yule Gruit, Unhallowed BGSA (10-10-10), Nymphetamine Barleywine (999)