I have a couple of 12 gauge to 45-70 adaptors I'm not using that I bought from

http://www.mcace.com/shotguninserts.htm

I'll knock $20 off his list price and cover the shipping within the US:

I paid:
For 10" length $95.00 plus $6.00 S & H
For 18" length $150.00 plus $8.00 S & H

So I'll sell you mine for $75 shipped (10 inch) or $130 shipped (18 inch).
If you want them both it would be $205 shipped.