When you have your tires replaced the balancing is usually included with the cost of the tires.
But if you take your vehicle to a tire shop to have the tires balanced without replacing the tires the tire balancing costs around $40.00 to $60.00 for all four tires to be balanced.
I've had two tires balanced at a local tire shop for $13.00 per tire but at some other tire shops I've paid $20.00 per tire so the cost can vary depending on your location and what tire shop you go too.
If your tires are not balanced though your tires can wear out faster so the small investment in getting tires balanced is well worth the cost.