[L20A]

That will be a good reason to not see a lot of companies packaging sets for Baritones.
I don't mind buying loose strings in bulk, but the prices need to be in line with the prices of packaged sets.

Shipping charges are also a factor in the cost.
I will keep my baritone in B tuning because it matches well with standard tuned guitars. I use mine on several songs that my band plays. It fits in very well.