Hey yeah, I am also worried about the cost, but I figured I would try to search for graduate assistantships either within the SW department or outside of it, if I got in; and other outside scholarships and see what I could afford. I really would love to be able to go there, but cost is certaintly something you really can't change...so the most you can do is try I suppose!
I also applied priority, but yeah, 3 weeks feels like a lifetime : /
Is BU high on your list for schools?