I pay $300-350 a month... depending on how many days of turnout, diet, and stall bedding. My horse is on full care which covers stall, daily turnout, and the staff will feed and clean his stall.
I think it is well worth the money for just the facilities. I board at the Texas Tech Equestrian Center. Here's some pics:
Here's a picture of the turnouts
These are pictures of the main arena.
There is also a round pen, two outdoor arenas, small turnouts, large turnouts, pasture turnouts, and nice roomy stalls. I also have a stall that I put my tack in. You have to share with other people, but it is cool.( I managed to squeez a mini fridge in my side of the stall) And for the full care people, there is a feed stall where the staff puts your horses food in so they can feed easier.