I recently was impressed by a couple companies I did internet/phone business with. I'd like to pass along my good mojo from them here.
www.Ultimate-Air.com currently has a free shipping promotion. The code is FShip8. I didn't see this advertised on the website, however I called the 800 number with questions and was given that tip as well. They're also offering "blemished" tanks for a $15 discount.
Shox Shop aka www.Shox.com was another excellent experience. I talked to Mark there who was very helpful, and offers a very good deal on Bilstein's. (Better deal than quadratec at least.) The longer than stock 5100's aren't on the website yet, but are available, part numbers BE5E670HO and BE5E671HO.