I was visiting Johnson City and saw Mr. K's and decided to stop. I'm from Charleston and we have a Mr. K's as well. The one in Johnson City is enormous compared to the one here. They have two floors chock full of books, CDs, and DVDs. My family and I had a great time. The prices are very reasonable and they always have something you want.
Mr. K's has a wide selection of: books, comics, CDs, DVDs/Blu-ray, vinyl, video games, and much more. Prices are fair and I've been able to negotiate a few times. They offer cash and trade value for books and other items. They're reasonable and won't try to scam you. The staff are always willing to help. They have bathrooms open to the public which have always been clean in my experience. I frequent Mr. K's often and will remain a loyal customer for the foreseeable future.