Ebay, but stay stock. The Ebay ones look cheap. The only way to retrofit OEM LCI lights in is to change out the rear trunk lid.
I have a workstation set up with DIS, TIS, SSS, INPA, NCS Expert, WinKFP, Tool32 with an K+D CAN interface; PM me if you want to stop by and code your car. ISTA/D + /P with an iCOMM interface finally here!