1. you can find them at the mob stores listed in the left navigation on this website.
2. if all else fails just have your pinkie "sized" ... and get a ring that fits it.

My first pinkie ring and the one I have on now is my old class ring. I just grew out of it. ;-)

I lost a really nice slender one somewhere in my apt. and I cannot find it for the life of me. It slipped off of my finger when I was sleep walking. LOL!