[Amps] heat sinks

[Larry]

Anyone got a good source of aluminum heat sink stock?

I know about Heatsink USA. Their prices are steep but not prohibitive. 
Unfortunately by the time I add on the shipping and handling charges, it 
nearly doubles the cost making it out of reasonable reach.

I'd like to continue fooling with solid state amps, but unless I can 
find a cheaper source of heat sink material, this is a dead end for me.

Thanks & 73,

Larry - W7IUV