Hope this helps someone, I bought one yesterday for myself.
Buy.com has the K-r 2-lens kit for $634. Fatwallet.com has a cashback program offering 4% back. eBillMe.com has a 10% cashback offer with a cap of $20. You need to use your bank's online bill pay feature to take advantage of the eBillMe.com's cashback offer.
Granted, you need to wait a couple months to get the money back, but money is money!
Buy.com - Pentax K-r 12.4 Megapixel Digital SLR Camera (Body with Lens Kit) - 18 mm-55 mm (Lens 1), 50 mm-200 mm (Lens 2) - Black Buy.com Coupons and 4.0% Cash Back eBillme. Shop Secure, Live Debt Free - buy.com