NCIX US offers the Intel Core i7-4790K Haswell 4GHz Quad-Core Desktop Processor, model no. BX80646I74790K, for $224.99 plus $11.99 for shipping. That's $33 under our mention from this past winter and the lowest total price we've seen. (It's also a current price low by $73.) It features a base frequency of 4GHz and an 8MB L3 cache.
Of note, new customers can take $10 off via coupon code "NEWCUST10MAY", dropping it to $214.99.