That is a damn good price on the dewback, no doubt about it!
FLOSI, if you don't have a Cantina set, I'd recommend one as it goes great with Greedo and Hammerhead. Pickled-up one of each set to go with the Cantina enviro that's coming out in July and glad I did (they display really well on their own, though, since I know there's limited interest in that environment).
Barryo, only issue I'd have with two dewbacks is I think they'd lose a little of their display power since they'd both be in the exact same pose. I get it's a really good deal but there's also so much amazing stuff on the way that will hopefully be available for preorder shortly after SDCC. My humble advice: keep your powder dry for those goodies!