As I do the occasional track day thought I would get the GT3 brake ducts for my 997.2 as they apparently direct more air onto the front disks albeit at the cost of a bit more drag I suspect. FWIW part numbers are 997.341.483.92 and 997.341.484.92.
As we traditionally pay through the nose here down under for spares was about to buy some on line out of Germany for around $A25 each including freight. But as a laugh I tried the local dealer expecting to abuse them as usual at their outrageous prices and use the OS price as a bargaining chip until they quoted me $A 6 each (about £4). WTF
That will surely be the cheapest part I ever buy from a local dealer 😎
The 996 Cup ones always used to be the bonkers priced option (they scoop a lot more air than any other option, but ISTR that something needs a bit of cutting to fit them to a 997 - unsure if it was the duct, arch liner or under tray though). IIRC the normal 996 ones aren't silly but the 997 ones have always been a fair bit less than any of the other options.
Footnote that the 997.2 rear ducts used to be silly money once upon a time, but they were also very agreeably priced the last time the subject came up.