It is doubtful that any local store would stock what you require...
There are several different contours(weights) and twists and in stainless or chrome moly... and a dozen different makers and qualities...
If you want an excellent stainless steel match grade barrel you can buy one directly from one maker in Sask... Ted Gaillard. Usually about $375 shipped... depending on weight, etc.
What are you going to do with a blank barrel?