How long will the SonyStyle CC $100 back offer last?

[poorcollegekid]

I tried looking for an end date for this promotion, but have come up empty. I am planning to get the 40 GB PS3 but would like to wait as much as a month or two for a possible price drop since SonyStyle doesn't seem to offer a 30 day price guarantee. From looking around, there seem to be mixed feelings on whether or not a price drop will occur, but I am willing to wait a while to find out if I can still get $100 back if/when the drop occurs. Does anyone know when this promotion will end? It also looks like I could get the card, and then just wait a while to make the "qualifying purchase" since I don't think you don't have to do the two in conjunction. Has anyone done this? Any advice? Also, with the 80 GB bundle being announced for June, is it more safe to assume that price drops are less likely to occur on the 40 GB between now and then?