I've seen the darn tough socks out here, but never icebreaker. I need to visit the one by me more often. I always say that, I've definitely gotten some great deals, but never do =(. I wonder if they get any of the icebreaker baselayers? I didn't think any stores around Boston sold icebreaker.
Marshalls/TJMaxx are really a bargain hunters dream, you never really know what you'll get but sometimes it's a big score.
but yea, I've found that the stuff they carry is regional since a lot it comes from other stores over-purchases, or companies trying to clear out old stock, etc. this usually comes up on fatwallet and slickdeals' "hot deals" forums.