The spot prices took a massive hike since the start of 2008.
In 2008 there was so much surplus DDR2 that the spot price fell dramatically (to around $1.00 IIRC), passing huge savings onto the consumer. However, when that subsided and the backlog was cleared, and production is phased out in favour of DDR3, the spot prices rose and carried on rising up to around $2.80, the prices are slowly on the way down again, hitting ~$2.60 not long ago and is currently tracking ~$2.2
Obviously we're not going to get back to ~$1.00 due to DDR3 taking over, but prices are slowly on the decline, i'd expect the spot price to be below $2 first quarter 2010.
http://www.dramexchange.com/
The same is true of NAND flash and the hikes we have seen in SSD costs.