Minuteman Masters practices on Hanscom AFB(just down the road) and at Regis College in Weston(next door to Waltham). I think new members fee is $215 for a 4 month session. You can find out all the info you would need at their website: http://www.minutemanmasters.com/...Blah/Blah.pl?b-news/

Hope this helps.

PS I swim for them and have only great things to say about the team. It doesn't matter what level swimmer you are...the spectrum is covered from end to end with different abilities.