It should be easier to find an iPhone 5s during the holiday shopping season. According to a report from AppleInsider that includes data from Piper Jaffray, Apple is catching up with demand, and as a result, 90% of iPhone 5s models are now available at Apple retail stores. For the two largest carriers — ATT and Verizon — availability is even higher. For ATT, 99% of iPhone 5s models are available, and for Verizon, 98% of iPhone 5s models are available. Compared to last year, and when adjusted for carrier market share, these availability numbers show a 0.8% improvement from iPhone 5 numbers. Availability has also dramatically increased in just the past two weeks. On November 11, only 31% of iPhone