I'm pretty happy with the Simms studded boots I bought last year, they were expensive though.
I think Saltwater Edge in Newport is the only site sponsor who sells boots (please correct me if I'm wrong) so they might be a good place to start.
Online there are several options, LLBean of course as well as Sierratradingpost.com where you can score some really good deals.
http://www.sierratradingpost.com/sea...&searchWithin=
You can get an extra 20% off by using this code at checkout (61947). I order a lot of stuff here, and for some items just get a few sizes and ship back what doesn't fit. It's only a flat $5.50!
I thought Sierratradingpost used to have a banner ad here, but I don't see it any more. Regardless, just like LL Bean they offer an unconditional lifetime warranty on everything they sell. You really can't go wrong...
-spence