They do have Cs, but the frequency would be like every 30 garden parties per 1 C, and T5 tends to have more stock as it's a bigger store, I once even come across a croc kelly cut.
I just bought one in Tadelakt from Ginza last month, it also costs HK$20000 ...
Just like I said before, I bought a 36 GP canvas at same airport store a year ago and it was 1125 pounds, while I believe in HK was about $18000 at that time