Here are a couple I've noticed ads for recently. Haven't seen them myself though yet.

Nikki:

http://www.theeroticreview.com/reviews/show.asp?id=172591


And here's another one I've seen lots of ads for lately, no reviews yet, Brandi:

http://eroticservices.cityvibe.com/escorts.php?do=view&post=802750

Most providers aren't 100% incall, so if you find someone Boston based who does a lot of outcall business, she probably has means of transportation to Dedham, I wouldn't target Dedham, but Boston instead, I wouldn't advertise as Dedham if I lived and worked there, I'd just post for Boston.