cheapbatteypacks is really good, or ehobbyasia.
4200 is a monster battery too unless your supper heavy on the trigger a 2000 mah would be fine and cheaper.
For mags and batteries I would use ehobby as they are always cheap and good stuff.
After you get verfied you could always ask around and see if someone has a thompson for sale. Could save you some money, but they are not that common.
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