Dell GPUs are overpriced, and they usually have a base price, along with an additional price to upgrade GPUs.
ie. The default GPU is a 9800GT, for $150
It offers you an upgrade to GTX285 for $257
The total is $407
This wasn't an upgrade deal. The base price was $380, then there were two coupons for 25% and 10% each.
I just tried to see if I could apply the coupon now (just to see if it still works), and it doesn't... Sorry guys This was a fire sale (according to the message on the Dell site, it was limited either by time or quantity).