The Tech Report charts the evolution of SSD prices since early 2011, you can check out the charts over here.
To get a better sense of the SSD picture, we've analyzed a mountain of pricing information dating from early 2011 to Tuesday. The folks at Camelegg graciously provided the data, which we've sliced, diced, and compiled in pretty graphs. Camelegg tracks prices at Newegg, which should give us a good sense of what's going on in the overall market.