List price was reduced today to make it cheaper than the M4, and then a promo code appeared--seems only for the 256GB model. $350 total vs. the normal online low of $390.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820147135
http://www.newegg.com/Product/Product.aspx?Item=N82E16820147135