You can find them on eBay sometimes, brand new. That's where I got mine and since I already had Premiere, I sold the sealed copy I got with the DV500 (on eBay).
It can capture digital or analog, which is cool.
Before you buy though, you should first do some research to make sure your computer will be able to handle the card because it conflicts with alot of other things. I haven't gotten my dv500 to work yet because :
1. I am too lazy to call the support line
2. I am not very good with the technical side of computers
Anyway take a look at the Pinnacle Systems (DV500) website
(the forums there are pretty good).