I wanted to give a shout out for pokerstud52 on ebay. I picked up a few decks from them. They have a lot of Bicycle decks at half what shopbicylecards.com charges. They will also combine shipping-13 decks was $6.95. Most of there sales are buy now. Just add the decks you want to your cart(don't pay), and email them. They will send a combined invoice.
Pokerstud's always been good like that. You can also email him with the list of decks you want; you don't have to place the order through eBay. In fact, you save a few bucks for him that way, since there are no eBay fees. He sends you a PayPal invoice, you pay it, you get your decks, easy peasy. He's been known to pass on the direct-order savings to his customer, too - I remember he had a standing offer for Discourse members. Ask him about it. In his profile here, he lists his email address as 52andjokers@fuse.net.