LOL! Someone overpaid their purchase by $3/unit earlier in the year. So after just a few months the price came down drastically.
User ID Price Quantity Date of Purchase r***2 ( 142Feedback score is 100 to 499) US $9.98 1 Mar-30-17 05:57:11 PDT h***h ( 65Feedback score is 50 to 99) US $9.98 2 Mar-18-17 21:29:22 PDT d***x ( 287Feedback score is 100 to 499) US $9.98 1 Mar-12-17 06:30:51 PDT 7***2 ( 218Feedback score is 100 to 499) US $12.98 1 Feb-18-17 15:01:04 PST a***b ( 44Feedback score is 10 to 49) US $12.98 1 Feb-16-17 09:55:09 PST s***a ( 106Feedback score is 100 to 499) US $12.98 1 Jan-30-17 00:27:07 PST 6***l ( 1780Feedback score is 1000 to 4,999) US $12.98 10 Jan-13-17 22:07:22 PST