There have been a few deals going on in the last week, and this is the best I've seen. As of the time this was written, there were still some of these available. The Canon 24-105 f4 L Lens comes with a UV filter and lens cap holder for only $840, which is $200-$300 below the current price at other retailers. It's listed as new, but it's selling for the price of a used model. It does come with a USA warranty and free shipping as well. Check out the link below!
It's being sold by eBay user getitidigital, who has a 99.6% positive feedback rating. There are even 5 reviews from people who have already snagged this lens, and they all give it 5 stars. The only iffy thing I could see what the restocking fee of 5% in their return policy, but a lot of retailers have policies similar to this so it's not all that unexpected. It seems legit, but always do your own investigating before making a purchase if you're unsure. (I'd trust ebay retailers much sooner than any of those shady grey-market dealers)
Leave a comment if you pick one of these up!