The average truck driving school cost to you can be in the region of $4,000 to $6,000. You should not pay more than that. There are places that offer the training free if you join the firm as an employee. Though, with these kind of firms, you will have to sign a contract which binds you to stay with them for a certain period of time. This binds you to them and can lead to problems. Remember this is a contract, and once signed, you will have to abide by it. This in turn will stop you from applying for a better job for some time. There are also driving schools which can cost up to $20,000, but the truck driving school cost is usually not that extravagant.
For more info, see Best Florida Truck Driving School.