It's probably not going to get much lower than $375, so buy up now people. Same thing happened with the GTX and prices went back up again after retailers stopped competing to put the product out closer and closer to the $0.01 profit margin.
There are no Crossfire boards available on Newegg. Newegg have already said that they will have a DFI Crossfire board for $230 something, but it isn't available yet.