Yes - price & content covered elsewhere, but not much on plants per bag.
I was fair 'mazed today, on checking my new peat-free bags, that they recommend FOUR aubs per bag. Certainly, with de Barbentane & Thai Green last year, I found 2 a crowd. This year they will be in 1/2 bags - widely spaced.
As to price - the comment that you get what you pay for may be true? Which reported differences. Contents vary a lot, & and the bigger the bag, the less the problem in watering.