Next year, Nec will be added to the mix. I don't see any chance of under $100.
And, it looks like Pioneer will attempt a HD-BluRay combo drive where Samsung and LG have failed.
Again - no chance of it being under a C.
In any case, I would go for an external that could be moved around independently. There are also guys who have modded XBox 360 drives to work in PCs.