Vintage T-Shirt Forum & Community Authentication Appraisals

So I found this at my local thrift store a couple weeks ago. Just curious if any of you have seen one before. I have it listed on my eBay store, and I received an offer of $100 for it. Not sure if I should take it, or wait. It's only been listed for about a week.

Sold! Did you get $300 for it?

$150. The guy sounded like he was a big fan of the group, so I was happy with the sale.