Sadlak Industries M1A scope mount (aluminum) $100.00 shipped
This is a pretty well respected mount for the M1A on the forums. You can read about it here:
I bought it in a package deal with my M1A. I never planned on putting a scope on the rifle and always planned on selling but never got around to it.
It comes with instructions and an inspection kit to make sure the receiver grooves that the mount uses are GI spec.
It has been used in the past and there are some very minor marks on the rail from whatever was mounted there.
They are 145.00 plus shipping new.