Tyler/East Texas Craig's List has a Weltmeister Cajun Accordion for $325 with bag. Link #2 or http://easttexas.craigslist.org/msg/4424367404.html. No more info in ad.
Sorry, I was typing on my phone and was too terse. There is a group on FB that is slightly similar to this website. Not related, though some folks from here are there.
If it's in good shape, $325 is very (and I mean very) reasonable! With bag!
And the Weltmeister is a great box for learning : light weight and easy to play.