What kind of cost are you looking at for a replacement barrel for a glock 19?
From what i have seen looking for a aftermarket barrel for my Gen 3 G20 was a lonewolf barrel is about $110-$125. Storm Lake $160-$230. Bar-Sto around $200 depending on model. KKM around $250.
Selling your stock barrel can bring good money depending on model. I will say $120-$200