A Universal is a commercial carbine. Some of the earlier ones had a mix of military and commercial parts, but most are 100% commercial and have different recoil springs, trigger assemblies, operating rods and other parts than Milspec ones do. They do not have a sterling reputation for reliability and will not command anywhere near the price of a true military carbine. I would say $450.00-$500.00 would be the ballpark. Maybe less.
In my area - GI carbine will bring $800-1400 with steady sales - local shop has been getting in a number of WWII rifles - very few are still sitting. The carbines have been out the door pretty quickly at $1200.
Quality, Underwood, Winchester - all sold recently - all GI mixed parts, GI issued stocks, and good parkerizing - solid CMP Service grade condition.
Universals - still sitting at $1000, with mags and ammo at the last gun show, most were put down immediately when IDed as a Universal.
YMMV