Most of the ones I've done are in the $400~600 range. But some big projectors have 2 or more lamps.
I think that mass production is bringing down the prices.
How many would they sell if the cost was $900 or more.

Ok, from the Panasonic web site a lamp for a PT50DL54J
DLP tv is $299 list.
So I guess this is a good thing for the people who buy them. John