I need a good clean gas tank for a 1981 280ZX non-Turbo Coupe, Please Help?

Any advice who might have one or where I can search for one, I did see a place that had refurbished ones, but thought $585 was a bit steep?

The Car has 39K miles on it and is mint - would love to start putting a few more miles on it

Please note me at gerick75@yahoo.com w/ any help you might be able to provide.

Thank you in advance