While gold and silver models of the iPhone 5s have seen very tight supplies since the device's launch last month, a number of potential customers have noted that availability of even the more plentiful space gray models has been declining. Using Apple's in-store pickup availability system, Piper Jaffray analyst Gene Munster has been tracking supplies of the various models and has quantified a significant decline in iPhone 5s availability over the past two weeks.Supply of the iPhone 5S has declined in the US from 27% of total SKU's available two weeks ago to 6% over the past week, based on our checks of 60 Apple stores. Separately, the percent of stores that had at least one SKU declined from 90% two weeks ago to 40% over the past week.
