I have a brand new Palmetto State Armory Premium Full Auto BCG for sale. Bolt is made of Mil-spec Carpenter 158 steel, HPT and HPI tested and phosphated outside and chrome lined inside. Asking $80 and can meet at Cabelas for Washington people. I will also be willing to ship anywhere in the northwest for $5.
I have been a member on SGT and AR15.com for years with hundreds of transactions if you are leery of the new guy
Here is a link to PSA, currently $99 there.
PSA 5.56 Premium HPT/MPI Full Auto Bolt Carrier Group - No Logo - 39339