Well damn, I didn't even think to look on Canon's site specifically. I figured they'd be way more expensive.
Is a refurbished lens better than a new, white box lens, though? Doesn't refurbished mean that it was broken at one point and then fixed?
Not necessarily... refurb equipment is stuff that is returned to the factory for whatever reason, which can include buyers remorse. They check out the equipment and make sure it's functioning up to spec. I bought a refurbed 5DII a couple years ago that had less than 100 clicks. I also purchased 3 refurbed lenses and 2 flashes, and never had an issue with any of it. Certainly some of the refurbished units could have been broken and then fixed, but with a warranty of 1 year, there is much less risk.
A retail box could have been damaged as well, but the lens is still basically new. So they check it... repackage it and put it in a white box.