Here ya go!
https://www.google.com/webhp?sourceid=navclient&ie=UTF-8&gws_rd=ssl#q=where+to+buy+a+brown+scapular&tbm=shop
Good googly-moogly! I see you can get them from Our Lady of eBay, Our Lady of The Catholic Company.... and a host of others!
I'm surprised you can't get 'em at the ballpark!
Hoss