Graph of RX-7 Prices vs Model Year
 

Here's a useful graph: RX-7 prices across model years:
Graph of Prices for Mazda RX-7 in USA - all cities

The yellow dots show RX-7s recently listed for sale across the USA. The grey dots are older than six days.

I hope you find this helpful!

-Daniel

Re: Graph of RX-7 Prices vs Model Year
 

Thanks for posting this. That is the coolest / best way to see what's available in the used market.