Dunlop SP20 tires

Guys

I have 5 brand new Dunlop SP20 145-R13 tires I would like to sell.
I bought them about 3 or 4 years ago, and have stored them in a dark, dry cool
place, my basement.

The problem is I suffer from C.R.S. (can't remember sh$t) and don't recall
what I paid for the tires.

I phoned several Dunlop dealers, they have no listing for the tires.

What is a fair price for the tires?

Thanks for any info

Greg Higgins
63 sprite