Good advice, but .... of course, a supplier is only going to recommend something that they carry, whether "excellent" or not ;)
With that said, I believe my previous employer got in Pillsbury (pretty sure it was P-bury...got it from Sysco) Basic Muffin Mix (or something to that effect) that you could add whatever you liked to. Seemed decent enough - pretty consistent and not a bad product, actually. The breakfast crew used these, I was busy doing lunch and dinner desserts from scratch...LOL.
Bakers - we make a lot of dough, but not so much money