I have an older 740 model which is now relegated to my gun safe (only keep it because it was Dad's gun).
The 742 was supposed to correct the issue the 740 developed, the bolt carrier assembly gets bent out of shape and they start jamming, distorting the bullet tip on loading etc, but they still didn't get it correct - which is why the 7400 came next and now the 750.
Without glass mounted maybe somewhere in the 400 buck range if it's a desirable caliber and it really is in "really good shape".
There was a program Remington had back when where they would buy them back (at a somewhat reduced price) because of all the bad press.
Just google Rem 742 Jam-O-Matic and you can read all about it.