I managed to drop my keys in the ocean, including my switchblade fob. Dealer quoted $415 plus taxes. Understandably, the incentive is there to search for alternatives. But after being enticed by apparently cheap replacements on eBay, and having looked at various forums, I've decided to not take the chance. Many posters advise against it; many of whom were burnt buying on eBay.
My dealer said that they can program the software but that the keys have to be laser cut at the factory.
I suppose one's damned either way. I even hired a diver to go down and look but the silt was 3 feet deep.