I saw 5 on a rack at Value Village, but that was in Montreal unfortunately.
What's your budget? You'd have to buy them I guess from a jersey store or somehow find a bunch of Flames fans to borrow them from. I do have one myself but it's unnumbered and it's not the old style.
Re: the hockey sweater story, what I found most disgusting on my visit to the hockey hall of fame in Toronto was that the Leafs actually went and ripped off this story and made it into a story about a Maple Leaf's jersey that you can buy in the gift shop! It was absolutely digusting, a total perversion of the original.