Editor's Notes & Price Research
Wireless flash shooting support is available (both radio and optical transmission) and improved continuious flash & expanded zoom range. Offer valid through April 18, 2017 or while supplies last. - DIscombobulated
$400 + free shipping
Granted they are thirdparty knockoffs, but they work basically the same, and for the price they cant be beat. This is especially true if you are just an amateur photographer looking for bang for buck.
This is the comparible model: