That's a good price for the reducer...
I paid about $20 for the bracket, but the reducer was being sold for $50+ I got the the extension, which I believe was a better value, if you want more rounds. The extension actually gives you an added THREE rounds in the tube if you're just using 2 3/4". I'm thinking of sending my barrel off to get choked, but I'm not sure if I'll have a problem, seeing as the barrel is thin and chrome lined.