Hello clarinet forum =]

I bought a clarinet this year, a lovely r13. When I bought it I also bought myself a bam trekking case, which I wanted. Now, a few months later, I've left with my Buffet Attache style case (for single b flat clarinet) and I dont know how to do with it. Should I sell it? I could bring it to my local music store, and perhaps sell it to them. It's never been used. It retails for about 150$, how much should I sell it for?

Heres a link to the case
http://www.rdgwoodwinds.com/buffet-attache-style-case-clarinet-p-513.html

Thanks~