Opteka Battery Pack Grip / Vertical Shutter Release for Canon EOS Digital Rebel - $89

Opteka Battery Pack Grip / Vertical Shutter Release for Canon EOS Digital Rebel XS, XSi and T1i with 2 LP-E5 Batteries (3600 mAh Total) $89 shipped @ Amazon

List Price: $179.99
Price: $79.95
You Save: $100.04 (56%)

* 2 Opteka Ultra-High Capacity 1800 mAh LP-E5 Batteries included
* Vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontal
* Buttons for AE lock, AF point selector, aperture value, shutter, and mail dial
* Increases functionality and convenience
* 1 Year warranty

pretty good price

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I just purchased one of these last month, it works great. I haven't used their batteries yet, I have charged them and they seem fine.