I'm in the market too... Cheapest I've seen all stainless (faucet, shank and tailpiece) is through this ebay seller... though it only works out to be about $10 when buying two without shipping so with shipping it might equalize or be more expensive when that's added compared with AHS flat ship rate.
I might try e-mailing the seller for a deal since I'm in the market for four complete sets.
I think Brewmasters Warehouse might be cheapest complete all Stainless sets I've found. They don't have a kit so you have to buy pieces separately but all Stainless 525SS setup runs a little more than $4.50 less than Austin Homebrew Supply and they charge $1 less shipping.
You could pickup 575SS's instead of 525SS and it'd still be cheaper $.50 before shipping.