I am in the exact same boat as you. I've contacted the program director asking if there are other scholarships available as well as financial aid to inquire about loans, etc. In both emails, I hinted that the cost burden was too large for me to be able to commit to, so I'm hoping that pans out. If not... hello to life-long, high interest debt hanging over my head :/
A couple weeks ago, I arranged a visit at one school that I thought would be my only viable MA option. It's for an Accepted Students weekend, and the dates are in early April... but I will probably accept at another school before the visit weekend. However, I am considering the same university for a possible PhD in the future as well as a summer language program this year... so: is it okay for me to still go to the visit weekend even if I will likely be committed to another school by then?