356 prices, and Porsches in general, have been crazy for about 7-8 years. A year after I sold my 911SC for $17.5K, they were going for twice that.
A couple of years after that, Jack sold the Dean Jeffries Carrera for $350K at an auction that every Speedster sold went for ~$1/2 Million.
6-7 years ago, you could find nice 912s and 914s for $10-$20K.