Might be heresy to post this in a forum of avid DIYer's who pride themselves on making stuff from scratch, however I think many will find it useful.
I found this website http://www.abelandschafer.com/
who sells commercial baking products retail. The only caveat is you have to buy big sizes, like 10, 25 or 50 lb sacks. The good side is I have tried their pretzel products and I can confess they are the REAL DEAL. They also sell NaOH but you have to buy it in 10kg quantities. (that's roughly 22 pounds). They also have dough improvers and conditioners which many folks trying to develop a commercial product might enjoy trying. They are expensive though. I have not tried their cake or bread mixes, but if they are anything like the pretzel products, they must be fantastic.
BTW, I am not affiliated with these folks in any way.