Varavon's latest product is a flip up style ViewFinder called the EX-Solo with models available for all the popular Nikon, Canon 5D / 7D / T2i / 60D, and even small Panasonic GH2 cameras. The ViewFinder attaches using the Tripod base adapter (no sticky frame here), and still provides an access port if you want to mount a quick release. The EX-Solo includes a diopter for those with less than perfect vision and flips up a full 180 degrees when the VF is not in use. The view finder stays put with a few magnets when it's in the closed position. Varavon pricing has always been a bit high, but quality has been top notch in it's other product line. At least it's still cheaper than the high end viewfinders. Looks like they are just getting in stock (click here).
Varavon New EX-Solo View Finder