Unless i'm missing something the price on the 1700x went back up to $399 very quickly.
http://www.microcenter.com/product/476004/Ryzen_7_1700X_34_GHz_8_Core_AM4_Boxed_Processor
Was still $349 as of yesterday at the Fairfax, VA location. Went with my brother and he picked up a 1700 though (he doesn't care to overclock and planned to use the stock Wraith cooler).
I had to go double-check at home because I couldn't remember if it was supposed to actually retail at $400 or not.