Costs vary depending on how large the surface but as an example, a gentleman I know with a 997 TT paid somewhere between $2500 - $3200 (wide range, I know but I forget the exact figure.)
Case in point -
https://rennlist.com/forums/rennlist...l#post18346334
Edit: Shameless plug for the OP of the Rennlist thread. I've seen the car up close and personal over the past few years and know the owner well. Meticulous owner and super clean car. Here's a chance for you 1%'ers to pick up a TT Pcar. Inflation and interest rate hike? What's that?