I'm a fiddler, please don't hold that against me. BUT have a burning need to play mandolin. I have just bought a flat back acoustic for my own entertainment, can't wait for it to arrive. So, here's my question about the strings (and thank you so much for all the postings so far, very helpful): I checked out JustStrings.com. The prices seem incredibly low compared to what I pay for violin strings. Are they listed per string, by set of 4, or by set of 8?