I've got several core bumpers. Most need to have dents/bends removed and be replated to be nice. They typically have minor rust on the back, but not deep pits. Price would be $65 each plus shipping. I would get an appliance box to cut down and wrap them in.

Cutlass
1968 front & back
1969 front & back
1970 front & back
1971 & 72 front & back

Toronado
1969 front

Others that have more serious rust issues, I can send photos but I'm not sure they would be worth shipping.
Toronado 1966-67 rear bumper
Delta 88 1968 rear bumper
Vista Cruiser 1971-72 rear bumper

Price would need to be the same as the good ones above, that's based on my time to pull, package and ship. Let me know if you'd like to see photos, I'll dig around to see if I have other years/models