Here's an interesting and informal interview with Nicholas Negroponte on the cost of the XO from One Laptop Per Child. At about 3 minutes into the interview he says:
"And we will announce within the next few weeks a pretty major price change, downward. Yeah, we will lower the price, very significantly."
But this forthcoming price drop is apparently due to the change in nickel prices and the drop in the dollar. In fact, Negroponte puts forth the idea that the XO laptop has dropped in "4 year old dollars" from $188 to $120. I'm not sure I agree with his math, you need $188+ dollars, no matter their age, to buy a single XO. But you can't actually do that. You need to have $188,000 to buy at least 1,000 before OLPC will even look at you or your dollars.
It is still interesting to listen to his logic and think about what could be that "significant" drop in XO pricing.