I made mine.. fairly inexpensive if you have the equipment..
I used the original one as a template..
I believe that they are 5/16 stainless round stock..
I do not believe it would be cost effective to pay a machine shop or welder vs what they cost from Memphis.
Call around, there has to be a dealer around that has them in stock that would sell them to you..
I believe Memphis has a list of 'approved dealers' on their web site somewhere..