I found this on Amazon:
It was delivered, and I found that the plastic mounting bracket was missing. Emailed them, and got a response in 2 hours. They offered a 40% discount or return/replace the item. I accepted the discount, and sawed off the rivet that held one piece of the plastic mounting gizmo in place. Screwed it onto my EggCrate and it was good to go (well almost - i also attached a small wodden "stop" because it would swing in too far with a cup in it).
In action, cradling some Balvenie 15.
It can hold a beer bottle (includes a beer koozie) and has a slot to accommodate the handle of your favorite coffee mug. Its a simple thing, but don't have to hunt for a place to put my drink down now!