For those looking for OEM GT3 Wing/Lid I'm not sure if this is the least expensive, but for my search it's what I found, OEM Porsche GT3 Wing/Lid including all the hardware and electrical harness at http://www.eagleday.com/ No affiliation, just want to help for those searching the market for bargains $1890.00 Ask for Philippe. He has 8 units left.

 

There's a sale on these from Germany. I think the sale ends June 30th.