Wow, I can't believe what some pay for hay.
We raise most our own hay, since we have cattle, but I buy some small rounds for one barn for the little horses. I get small squares of grass for $90-120/ton, they are about 70# bales, so that's about $3-4/bale.
Large rounds, go for about the same price per ton; our rounds are about 1200-1300#/bale, so that's about $60-70/bale, maybe more or less depending on the ton price and the size of the bales, some rounds are only 800# (our homegrowns are quite large and dense).
If I paid what others do for hay, I might be lucky to have one mini, rather than a dozen plus two saddle horses.