It's a controversial viewpoint but I don't have an issue with these scalpers. This is just supply and demand. Nvidia should release more cards instead of artificially limiting the supply on release day. Don't buy into the hype.
Don't buy the card on eBay for more than Nvidia's MSRP at launch and these scalpers will be stuck with their cards. It will not hurt you in any way to buy the card a few weeks later, on the contrary... Some of the initial bugs will be ironed out and you as a consumer will be able to make a better choice since there will be a lot more reviews to look at as well.