S.D.
i did gymboree from the time my daughter was 7m old until just this month (she turned 3 in feb). it WAS worth it -- they used to do a thing where it was half price after the first year, but the cancelled that. mommy and me (www.theoriginalmommyandme.com) is also fabulous. we did lake grove and rocky point, and i met a lot of nice moms from there. my gym just opened in stony brook, and is also great, but the employees (including the owner) come on a bit too strong, in my opinion. they're also pricy though. good luck!