There are major differences in accuracy between static balancing and dynamic balancing of vehicle tires. Static balancing doesn’t take into account dynamic motion of the wheel and tire assembly and is only very rarely used these days. If it is used at all, it will usually only be to get a general idea of the overall balance of a tire and wheel assembly. The very low number of shops that actually still use static balancing makes a price comparison very difficult. Dynamic spin balancing of your vehicle’s tries should cost no more than ten to $15 per tire. Static balancing, being much less accurate, should by rights, cost much less.
For more info, see What is Tire Balancing