Used book store

We have a used book store in town that I've had an account with for years. I've "given" many books to them, and purchased many as well. I have several favorite authors - mainly mysteries - that I enjoy reading. Turns out I've read all of their books and now am in search of new authors to add to my list! Only, I don't want to spend a lot of money on new books only to discover that I don't like their writing, or that it's (or should be) rated "R". This afternoon I ventured over there (after perusing amazon for ideas) and found three books to read, all for a mere $6.00!! I'm grateful for used book stores, especially the one we have in town...just because it's close by. :)