The throttle position sensor costs between $50.00 to $90.00 and it's a pretty easy job to replace the throttle position sensor yourself if you know how.
It basically just comes off after you remove the mounting screws and and then should easily come off and then just unplug the plug attached to the throttle position sensor.
Then just reverse the process.
However if you need to or want a shop to do the job expect to pay $100.00 in labor cost so be prepared to spend around $192.00 to $250.00 for a shop to replace the throttle position sensor.