I'll list a few.
Entertainment Earth - Found this after searching for 2006 Vaporizers that I was looking for on Google. They have 2006 Flash Floods, Liquidators, Vaporizers (which I have purchased 2 of), and Oozinators. This place is good, and they ship worldwide! The Flash Flood has just come in stock there, so I assume that the rest will in the next few days.
Amazon - Has most of the 2006 line, including a fair few of the good Water Warriors guns like the Blazer .etc.
Walmart - Has most of 2006 line, the most familiar ones, like the Arctic Shock, Flash Flood, Overload and the Oozinator.
eBay - Not really a store, but still, more people getting 2006 guns on there.
As for locally, not much in my Toys'R'Us, nearly all last years stock as well as the year before (although that's slowly starting to go), one interesting thing they do have are Water Warriors Hornet or Cricket (not sure, didn't really look too much) 2006 twin pack as Splash Gear, they also had the Wasp as a new Splash Gear pack as well, but only one Wasp in.
Everywhere else is even dryer really where I am, luckily there are internet and online stores!

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Edited By Wild Boys on 1146501847