EVGA Step-up Program - Question

I recently bought a 9800gx2 that I haven't been too impressed with, since it's giving me some stuttering problems on some games. I get great FPS, but it tends to stutter... it's noticeable on many games, but most notably Age of Conan (drivers updated, even tried leaked beta drivers). So it seems like it will be a good time to use EVGA's 90-day step-up program once the new GTX260's and 280's come out, which should be fairly soon (I got my card about a month ago).

I'm just wondering how I should send my card to EVGA. It says to send it with all the original packaging, but I no longer have the anti-static bag the card came in. Like an idiot, I threw away all the packaging materials from all the parts of my new computer. I don't think EVGA would screw me because of a bag, but would I be able to substitute anything else in it's place, like a ziploc bag? Or is there anywhere I could buy an anti-static bag?