I sold a couple for a friend for south of $450, it may have been south of $400. Pacific Research is same pretty sure. I have one on a Bob Green .270 I love it.
I have one on a Mod 70 and love it. I bought mine a few years back and it required a lot of fill and fitting. I understand they have new molds and are drop in fit. I'd ask $500 to $550. I like it better than a McMillan, lighter and fits me better.
If it is indeed a Borden it's probably a good stock. I had 2 when they first came out by Rimrock. The forends (black in color) would warp if they warmed up by the sun/temperature contacting the barrel and throw the POI way off.