Max’s Note: Here’s a really good deal for making your existing DSLR flash wireless for just $23.69.  Great deal if you ask me. This Wireless Flash Trigger is a radio remote system for firing hotshoe or PC-connected flash units wirelessly. It consists of a transmitter and a receiver. The transmitter fits into a camera’s hotshoe and the receiver clips onto the hotshoe base of a battery-powered flash unit. Just turn the receiver on by sliding over the power switch, and then take a photo. That’s it. A radio signal is transmitted from the transmitter to the receiver that instructs the flash to fire. The wireless flash trigger costs only $23.69, which is a much cheaper than investing on a high-end camera that comes with wireless flash controller. via Source