02 Bravada Engine Lifespan?....Where to get a new one?

:) Hi, my name is Julia and im new here... but i was just wondering if any of you knew when i should get a new engine for my Bravada... i dont exactly have it now cuz i just came back from japan and im letting my little sister use it to get back and forth to college, but i think it has almost 200,000 miles on it and i dont wanna have to start buying a new car... i still owe like 10,000 on it.... ugh....
But should it be fine? or you think i need a new engine soon? and if yes where is a good place to get one and how much do they cost?

If you've been maintaining the engine and it doesn't have a problem, then you shouldn't need a new engine just because it's a high mileage engine. If you are having problems, I would definitely look into getting your engine rebuilt rather than buy a new/used engine....