Amazon is offering the core retreads here
These searches also revealed an effective Amazon pre-announcement of an SpC retread available from 16 Apr 2013
Ed: fixed the URL tags
π = 4
Consider a 5' radius blast: this affects 4 squares which have a circumference of 40' — Actually it's worse than that.
Completely Dysfunctional Handbook
Tomb of Battle
: Fighter, Monk, Samurai, Blade Dancer, Knight, Swashbuckler and Ninja.