First of all 8 valve, Welcome! Thanks for joining us here,
I do not know where to get new barrels for the 82, but I am wondering a couple things.
If it is solid and shoots accurately for you, why go through the trouble of a new barrel?
The barrel is fixed and a bear to replace, are the scratches and pits (maybe from corrosive ammo) to deep to fluff and buff out? may be cheaper and less aggravating than trying to put in a new barrel.
Consider some alternatives first before going through too much trouble and spending too much money on a $200. gun
Just some thoughts...
NVCZ