Affordable barns with decent trails near Boston?

Hi!

I’m moving to Boston in about a month and I need to find a good place to board my horse. He’s older and has some joint issues, so I’m looking for a low key, smaller, affordable barn for him. He is pretty low maintenance, but needs individual turnout. I’m not too picky about facilities, but some sort of outdoor arena and trails would be sufficient, and an indoor arena would be a luxury. I’m looking for something for about $700/month or below for full care board as I’ll be working an intense job and won’t have the time for rough board. Any recommendations?

Thanks!