If they’re that expensive I suspect they’re proprietary. Companies tend to be evil like that. You may have fallen for their con I’m afraid. Might wind up being cheaper to switch
devices in the long run. Sometimes you get lucky though (greed and laziness are related after all) and the company trying to screw their customers with high priced replacement parts gets lazy and you can find something equivalent. I wouldn’t hold your breath though.
The gamma i seems to be an old old style
cigalike so it’s going to be the lousiest possible vape from the start. The bright side here is the chances they Diddnt bother to make their own connector are high. The bad news is there’s like 6 or 8 different connectors it could be and several of them are quite rare.
The most common one is 510 which it is not. Next comes the 808, then the rn45, and some others whose names I forget. It could be something really stupid like a reverse 510 in which case you’re hosed.
My first advice is to throw the thing in the trash and get a decent
device at a real vape store instead of shopping at the gas station.
Failing that though there’s a decent chance it’s an 801 or 808 connector