I put rear rotors and pads on both sides and a caliper on the driver's side of a friend's Ford F53 chassis delivery truck.
Assuming you're on an F53 gasser chassis, the rotors were about $125 for a set, the pads were about $50, and the caliper was about $125 (maybe $75 after the core charge?), all from AutoZone. It was a straight forward brake job, so I would think you could get it done for around $400. Almost anyone should be able to do it.
Typing a reply like this one makes me wonder what possessed me to buy a Class A Diesel Pusher that's so much harder to work on than a gasser!