We’re looking for a different supplier for our treatment chemicals just to evaluate our options. Any suggestions?
I always believe that local suppliers are your best option. They understand your local needs better than someone else and the extra cost [if it's extra anyway] is worth that knowledge. All soapbox preaching aside, however, that's not always an option. I would recommend using Thomas Net to take a look at what options might work for you.
You might also just have an honest conversation with your supplier to discuss your needs. I've always found suppliers to be pretty flexible.