I can do a static balance, either by putting on a drum brake hub loosely adjusted (spin and mark where the heavy spot is) or with a HF cone bubble balancer (never the same spot 2x it seems.)
Otherwise Walmart will do a one time balance for $5.
65 series and up seem to do fine with static balances. 60 series: some do, some don't, but they all do great on the rear axle. So yes I have some random tires that have reserved corners on my car.
The REAL benefit is the used tire pile at the junkyard, $5-10 ea, combined with the savings of free mounting, gets substantial. I inspect my tires, they're fine, and I don't have to hear about the road hazard etc spiel at the tire shop. I've bought $250 cars midwinter with bald tires and no heat-- a $10 thermostat and a few used tires and I've cured all the reasons the previous owner couldn't get around!