$54/$45 off for D300 from adorama/bhphotovideo
here is the deal: http://www.jellyfish.com/products/offerings/18003/8763502
in order to get the discount, you need to register at jellyfish.com. if you are ordering one from one of these sites, why not get the discount, it is better than nothing.
when you register at jellyfish.com, please fill out email@example.com in the optional box for "Email of the person who referred you", that is the email for yours truly, thanks.
what is the catch:
no catch. JellyFish, a Microsoft company, enters into agreements with resellers for commission, and then they split the bounty with the customer. It is free to sign up, and I've heard good things about them. More info: