http://svc.mt.gov/msl/mtcadastral/ this is a awesome site independent of montana fish and game its basically at plat book with topo and aerial. you can do search by county/owner you name it.
By topos, do you mean 7.5-minute quadrangles, which are 1:24,000 scale, or BLM Surface Management maps, which are 1:100,000 scale? And do you want electronic or paper?