Ruth,Planning ahead, we've started looking for sources for the LS3.
Pace Performance and Fred Beans in PA seem to be competitive. Does anyone else have a source that is worth exploring?
I would recommend checking out Scoggins-Dickey, they are one of the largest GMPP dealers in the country...for example, here is two of their (Manual Transmission) E-ROD packages:
6.2L, 430hp GM Performance Parts 19257234 - E-ROD LS3 Crate Engine and Emissions Package (for manual transmissions) | SDParts - 1-800-456-0211
5.3L, 315hp http://sdparts.com/details/gm-performance-parts/19258008
The E-ROD is the GMPP "kit" that is fully CARB certified and emissions compliant...something to think about if you can't nab one of the SB100 exemptions there in Kalifornia.