Lots of pawpaw info from KSU:
Kentucky State University Land Grant Program: Pawpaw Information Website (somewhere they should have a list of the varieties they are testing in their regional variety trial.) They have a list of nurseries that sell pp - the best that I know of is
Forrest Keeling Nursery
88 Forrest Keeling Lane
P.O. Box 135
Elsberry, MO 63343
(800)356-2401
info@fknursery.com
RPM Trees from Forrest Keeling Nursery
They carry: Allegheny, Potomac, Rappahannock, Shenandoah, Susquehanna, Wabash, Mango, NC-1, PA-Golden, Prolific, Sunflower
Of those I know well and like very much the Potomac, Shenandoah, Susquehanna, and NC-1.