Whats are these catalytic converters worth?
 

So I have two exhausts, one off my rx7 with 117k on it, and another off a 1981 rx7 with 41k original miles on it. I'm planning on using the 81 exhaust but doing a cat-delete pipe so I was wondering what all the cats should be worth roughly if i were to go scrap them as to avoid getting ripped off. Heres a pic of the cats:

http://img256.imageshack.us/img256/4660/p8050097.jpg