I'm not sure if it was because of me, but after featuring Sima's inexpensive quick-release system in a recent episode, they were soon sold out. Amazon is carrying them again, albeit at a slightly higher price than before. These were a smokin' deal at $8.65 and now can be had for slightly less frugal $10.20.
The Quickonnect is a hard plastic plate that you can attach to any device with 1/4" 20 threads, the standard tripod mount. The plate then locks into a puck-looking device (which has metal threads) with a great spring lock system. Once inside, the plate stays put. I really like these and have equipped all of my camera rigs with them. I'm glad they are available once more. I'd love to see them drop to $5 for the ultimate deal.