To be honest, I bought this portable LED light from Ephoto. I was sort of skeptical at first, since most portable LED's on low budget don't produce much light at all but this thing has come in handy!
http://www.ephotoinc.com/professional-led-light-312-led-bicolor-changing-dimmable-light-pa312.html
Its $160.. But it comes with 2 batteries, you can dim the light & also change it from a yellow tone to a white tone.
It comes with a grip handle that you can attach or it can go on the camera. This light has saved me multiple times being in the middle of nowhere an still being able to shoot very low ISOs because I had this on me. Comes in a nice bag and you can carry it anywhere or in a backpack. I definitely recommend it, and actually if you look at the topic above or below this one, I posted a video w/ my T3I using this light at night.