Hi Christina: Jeff Ferris (of Ferris Wheels Bike Shop) does snow shoveling around the Monument on South Street. If that's where you are, you can call the bike shop at 617-524-2453 or stop by 66 South Street to talk to him about rates. His small crew shovels snow for residents as well as quite a few area businesses, and I'm sure he could give you references. Hope this helps!
We use EDD Landscaping. They charge us $100/visit and send 2 guys with snow blowers (which is good given how steep our driveway is). Our house is at 56 Wenham (also 3 unit condo) if you want to get a sense of how much $100 buys you. If you'd like to contact them drop me a line and I'll make an email introduction.