Not sure where to get it locally in New England but if you want stripper clips think about a case of two of Yugo M67 ammo already on strippers (it also comes not on strippers so make sure you get the right stuff). It is corrosive but it's for a SKS, not a x39 AR. It's brass and great shooting ammo and the stripper clips are the best, not the crappy new Chinese ones that are hit or miss at best.
All you have to do is clean the gun normally after shooting and the corrosive ammo is no big deal. If it's a Yugo SKS make sure you clean out the gas valve, corrosive ammo or not. Those things are why I don't own a Yugo SKS and probably won't unless it's an older M59 without the gas valve and grenade launcher, not a M59/66 or M59/66a1.
I am not familiar with MA laws about ammo but if you have a way to get ammo shipped to you PM me and I can let you know where I have ordered M67 ammo from. Maybe a MA dealer can order it for you?
Most still ship to CT with the proper CT permission slips.
A case of this is 1120 rounds already loaded on the best stripper clips, the real Yugo milsurp strippers. Cost is between $375 and $390 delivered to CT depending on where you get it. That's about 34 cents a round which may seem steep for corrosive ammo but remember this is really good ammo and you also get 112 top quality strippers that can go for $1 each (and who doesn't want 112 top quality strippers ).
If you order the case it should come in a sealed tin can inside of a nice wooden crate, which is nice if you want to keep some unopened for long term storage, or even general storage after you open it up. I keep some unopened myself but I really like it for my SKSs and I have some that I did open so I could shoot some too.