M-1A is a registered trademark of Springfield Armory, Inc. It is what they use to label their M14-type rifle. While they did make a few in select fire long ago, M-1A's are pretty much a semi-auto only version. Technically, only SA, Inc rifles are M-1As because that's their name.
There are other makers of semi-only M14-type rifles. Armscorp, Smith Ent., Polytech, Norinco, Fed-Ord, to name a few. They're called various things, usually a variation on "M14" like M14S, or M14semi, or whatever.
Other than the receciever and it's lack of full-auto capability, there isn't usually much difference between a selct and semi-only gun. Quality varies greatly though, as some use USGI parts, some don't. Also the quality of receivers and the build itself varies greatly as well.
Expect to pay in the $1200 ballpark for a high-qualtiy M14-type rifle that is semi-auto only.
To get a good idea, go to one of the auction sites and search for "M-1A" or "M14" and see what comes up.
Ross