So much depends on your location and what the facilities have to offer.
I board at a small private barn, the BO lives on site. No arena, no wash stall, no fancy extras.
Full turnout weather permitting, horses have a stall when they need it. BO will blanket as needed. Round bales outside, grain as per owner request. (My older guy gets fed a fair amount of senior feed, young guy doesnt need any).
Board is $250, I get a deal for having 2 horses.
I pay $450 total for 2 horses. I consider myself very fortunate.