A question about yeast for all you bread bakers out there

My bread making is pretty amateur. I've been making my own, mostly sandwich loaves, buns and pizza dough for a couple years due to food intolerance issues (emulsifiers and colourants mainly). I go through a fair amount of yeast - those little packets aren't going to cut it. What's a good yeast I can buy in larger quantities? I've purchased bricks of SAF before (don't remember which kind) and was pretty happy with it. When it ran out I found a 4 oz jar of Red Star active dry.

I believe both of these contain sorbitan monostearate. I think it's an emulsifier and may or may not cause a problem for me, many emulsifiers do. Are there any good brands that don't have this ingredient that come in sizes larger than packets?

The breads I make are VERY low in sugar. I think that can be a factor in what kind of yeast one should choose. Correct?

I'm happy to mail order. Any suggestions greatly appreciated!