BRP's stuff was for sale at one point, but Edd has it all now from what I understand and he's probably sitting on it so nobody else can have it.
I wouldn't use NOE or Arsenal blocks because of the poorly-engineered alignment pin setup.
Tom offers blanks, I think, but if I were going to order from him I'd just have him cut the mould minus the tips and finish the cavity points myself with a safe-edge D-reamer. May still do that
I got some 3/4" x 3" flat bar from Keith, should make fine blocks on the table saw.