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Sigma 17-50mm f/2.8 EX DC OS HSM for Canon/Nikon/Pentax/Sony for $599 Amazon/sold by Adorama
Edit: Looks like the price changed and this is dead. I did enter an order for the $599.99 price. Here's a screen cap of my order confirmation. Probably going to get my order cancelled if it didn't show up for anyone else.
I've been looking at purchasing one of this Sigma 17-50mm f/2.8 EX DC OS HSM lens as a more reasonable price point compared to the Canon 17-55mm f/2.8 IS USM and the price had been $669.99 for the last month I had been following it.
I'm currently seeing $599.99 for the lens at Amazon, sold through Adorama:
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