DigJungle via eBay offers the Canon Speedlite 600EX-RT Professional Camera Flash
, model no. 5296B002, for $399.99
with free shipping
. That's $154 under our August mention (which came bundled with a battery charger) and the lowest total price we've seen. (It's a current low by $94.) It features an LCD panel, 180-degree swivel, and radio-controlled wireless transmission.