actually, i've found that Amazon.com and barnes & noble.com are well stocked, and ship quickly - overnight if you're in a rush. i've had good results ordering from lewellyn as well.
lately, my preference is to order decks through my local metaphysical shop though. i save on the shipping, and i like to support the community. she gets them pretty quickly, usually within a week, assuming she doesn't have them in stock.
luv and light,
nexy