Roger Cicala (LensRentals.com) is the latest to provide an addition to the Canon EF 70-200mm f/4.0 L USM Lens Mug Review
Roger has discovered a no-additional-cost source for Canon lens mugs:
I would add though, that for those who don't want to pay the high prices being asked on eBay, it is not to hard to not only make your own lens mug from existing lenses you have around the house. The do-it-yourself method allows you to make mugs in various sizes - and mugs that can serve in other useful capacities.
After some trial and error, I've found it usually is best to drop the lens, sans hood, face down on a concrete floor from about 4 feet. The remaining work takes little time and can be accomplished with some sturdy pliers and a bit of superglue.
I'm sure Roger's creative method voids the manufacturer's warranty.