It would seem that the lower priced iPhone 5c is not very popular with Apple fans as the 5s model has sold twice as many units.  This has required some changes be made to production lines at Foxconn and Pegatron as Apple's sales estimates of the two models were way off.  Until the lines can be retooled to ramp up production of the more expensive model you can expect to wait a bit for your shiny new iThang to arrive.  DigiTimes doesn't mention what will happen to existing supplies of 5c's, they may simply age in a warehouse until someone is willing to pay full price for one.

"Taiwanese electronics manufacturer Foxconn is shutting down production of the iPhone 5c in one of its factories in order to shift production to the higher-end iPhone 5s, sources claim."

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