I can always use a little extra money!

So I was thinking of possibly "trying" to sell on Craigslist (maybe even epay)...
I have many used cassette tapes, mainly 90 minutes.
Also mainly...
Maxell XL II, Sony UX-ES, & TDK SA's
Some...
Maxell UR, Sony HF, & TDK D's
Any idea of how much I might get? $5 for 20 tapes? Is it even worth trying?
If any of you forum "guys" need any, PM me...
TIA,
George