Bristol Palin -- Dumping Old House For New Fiance

Now that Bristol Palin's got a man ... she has no need for a house -- at least not the one she's been living in because she's unloading her half a million dollar home near Sarah Palin.

Real estate sources tell TMZ ... Bristol is rarely home now that she's all hooked up with her new fiance, Medal of Honor winner Sgt. Dakota Meyer -- so she doesn't need the 3-bed, 3.5-bath 3,200 sq. ft. pad anymore.

She snagged the lakeside digs in Wasilla back in 2011 for $388k, but now wants $549k for it. We're told she completely remodeled it -- plus, it's got sweet mountain and lake views from the master bedroom.

As for where Bristol and her man are moving -- we're not sure yet, but we'd be shocked if she ended up in the Lower 48.