B&H Photo has the CamRanger Wireless Transmitter for Canon for $199 (Reg $299) today only in the DealZone.
You can see if/how compatible your Canon DSLR is by using this chart.
PRODUCT HIGHLIGHTS
- Control DSLR Remotely via iOS Device
- Photo/ Video Capture, Live View, HDR
- Intervalometer, Bulb, Focus Stacking
- Control Shutter Speed, Aperture, WB, ISO
- Metering, Drive/Shooting Mode, and More
- Creates Ad Hoc Wi-Fi Network
- Effective Range: 150′
- Works with iOS 4.3, Android 3.2 or Later
- Mac and Windows Compatible
- USB Charging & Ethernet Cables Included