I can't help myself. I've got enough PA fiction to last me three lifetimes but I just can't resist a freebie. These are all free at the moment on Amazon UK, maybe US too but I haven't checked. I can't vouch for any of them as I haven't read them yet but I'll let you know when/if I get to them :)
The first two are actually box-sets with each having books 1-3 included.