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Flash Sale for Superlux HD668B [gearbest.com]
$ 26.39 + Free Shipping
Promo ends in on June 29, 2016. 82 units remaining as of original post.
Chinese dealer so expect average of 2-8 weeks delivery time.

Well known budget (but quality) semi-open headphones with unique detectable cable setup.

Reviews
Head-fi [head-fi.org]
Zeos [youtube.com]