That was an excellent deal. Prices for cameras seem to rise and fall for no particular reason.
About six years ago, when I bought my first Contax IIa, prices were high, and I paid $300 for a Contax IIa and a prewar f/1.5 Sonnar. That seemed to be the average price.
However, in the past year or so, I've bought two Contax IIa's -- one with an f/2.0 Sonnar and the other with an f/1.5 Sonnar -- and I paid less than $225 for each.
EBay sellers such as Arsenall, Kevinscameras, Camera$ and certain other sellers who ask absurdly high prices for their gear have had the overall effect of pushing up prices, I think.
I think the price range that Raid stated is about right, although there are still deals to be had on eBay. You just have to look harder. Last year, I bought the barn door Vitessa with the f/2.0 Ultron for $49 -- admittedly, the seller marked it as "Yoighander."
Last week, I bought the prewar Zeiss turret finder for the Contax II for $67. That was a very nice pickup, as these generally go for twice that amount.