BH, Amazon, and Adorama all raised their price by $100 or more after the rebate took effect, so the rebate is useless at this point. They are still selling 50D for $999, in the last few weeks BH and Adorama had theirs at $929 and Amazon at $944. I know because I was in the process of purchasing one and watching prices, waiting for the rebate to take effect. Stupid me, I thought the price might actually go into the high $800 range.
Calumet is the only dealer I have seen online that actually applied the discount, they are still at $889.