The average cost for a maintenance tune is around 270$. If you are looking for a performance tune it is best to start with a dynamometer diagnostic test which will cost $400+. You can then use that information to pick and choose the parts you would like to replace.
It helps to decide what you want to look out for and potentially change beforehand.
Determine your own budget and replace what you can afford.
Here are some other resources to help you tune you car: