Feeler - Used ECU Price?

[RussMcB]

Would you guys mind sharing your opinion of an appropriate selling price for a good working ECU from my '91 ZR-1?

I have an aftermarket ECU, and had planned to hold onto my original computer, but someone has approached me about selling mine.

Mine is a bit scratched up (not pretty), but AFAIK has no issues. The car has 67,000 miles. I could sell it with or without the Haibeck chip I had been running.

Thanks in advance.

Russ