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You'll need a large tank to keep just a couple of trout (if permitted in your state). They require clean cool water with a heavy flow providing a high DO. The temp would have to be kept between 60-65F so a chiller is needed. They can tolerate higher temps for a short duration but would need cooler water for proper maintenance. Filtration would have to be oversized as these fish have little tolerance for poor water quality. Trout are territorial so, the tank size and vision breaks (caves, rocks, driftwood, etc) would have to be sufficient to allow rivals some cover from each other.
Unfortunately, the farms that can provide you with trout have minimum purchase requirements mostly around the $200 range or a minimum number of 50 specimens you'd have to buy. If you don't live near a trout farm, the shipping costs will be astronomical.
As far as native fish setups go, trout are among the most difficult. I suggest hitting the web for trout care and maintenance before you try setting up a system for them. Also check out NANFA (North American Native Fishes Association) for lots of info on maintaining native US species.