I do not know of a good price either. You could look at one on Ebay to see what the going price is?? If this is someone you know selling it, I would also ask them to make sure they have "deactivated" it from all their devices. EQ7 as well as EQ8 only allow active programs on two computers for one registration number. That can be done in the Start Menu (I think ... it has been a while since I had 7 installed).
https://support.electricquilt.com/ar.../deactivating/