Have you seen this review at endless-sphere?
Endless-sphere.com • View topic - Battery Space 20AH Prismatic LiFePO4 tests
In that thread I noticed this link for a 4S 20AH pack from elite power solutions,
Elite Power Solutions
The GBS cells look good, if my 12V Headway aux pack in my Geo Metro EV dies, I might go that route.
Joe