Just found out Canon Direct will be having a sale February 24-27. It reads "20% or 30% Off Refurbished Lenses"
20% Off Select Refurbished EOS Digital Cameras (Excludes 5D Mark III Refurbished)
Most likely the 30% off is on the entry level 55-250 or 70-300 but even with the 20% there's some good deals and stock appears to be good at the moment. Remember this doesn't start until February 24th.