Yeah, I would LOVE to see what jetBlue got their E-190's for..., IMO they probably have obtained a smoking good deal on them. If the E-190's are profitable for JB (and I am willing to bet that they will be), Embraer will have a tough time building them fast enough to keep up with all of the orders coming in.
But back to US Airways, I am sure that they had a good price, if anything in return for helping iron out many of the initial issues with a new aircraft. Probably part of the reason they were able to get so many prior to, and even in BK, because they were a bargain that could be resold/re-leased easily.