Squidy. I'd look online. The 24-70 II is not typically more than double the Tamron. At least here in the US, the Tamron is $1,299 and the 24-70 II is $1,749 after rebate.

But, if you have time, I would watch the Canon refurbished store. I picked mine up for less than that. Looking at the current sale list, it doesn't look like it is included, but Canon's website is down so I can't double check. Alos, if you want the 70-200 f/4 IS, that is a great price.