Help choosing fork

I need help finding a new front fork for a monggose stat 29er. dont know the specs on them i want a fork (preferably sr suntour) with 80mm of travel, lock out, not too crazy but has what it needs. Under $200 too (and yes i know they exist at that price). Not sure of steerer tube size or if tire will fit or anything so i just need some help on this. Has anybody else done this to their stat already?