Unfortunately, 13 is one of the hardest sizes to obtain. I wear a size 13 in Roshes and have almost every Men's colorway (only missing the Mangos) and it took a little bit of work for 2 of the colorways. Luckily there are quite a few Sheikh shoe stores here in Houston so it made the hunt a lot easier. I made a call to Nike store months ago and they were able to locate me the last pair of 13 in the Calypsos and had Niketown in Beverly Hills ship mine out via phone order. I got lucky and also found 2 pairs of Iguanas at Nordstrom Rack here in town. For the Sport Reds I had to resort to eBay a few months ago but luckily I only had to pay $10 over retail. Unfortunately, our feet are too big to even consider purchasing women's colorways. Don't give up on finding your size 13. You may have to resort to paying $100 (minimum) per pair but if you see a deal, jump on it quickly. Supply is becoming more and more limited but don't get discouraged. They are definitely out there.