Affordable, Portable USB Power Supply

[brennan.rusnell]

Hi,

I am looking to buy a portable USB power supply for my iPhone 3G.
I will be flying next month, so I need something to provide additional power while I am in the air.

I have searched around, and found:

IGO® POWERXTENDER UNIVERSAL AA BATTERY-OPERATED CHARGER
http://www.thesource.ca/estore/prod...atalog=Online&category=iGo-HO&product=2739104

IGO POWER TIP-A133 (adapter for iPod/iPhone)
http://www.thesource.ca/estore/Prod...alog=Online&category=iGo-Tips&product=2739128

I live in Canada (so I can't buy from places such as Amazon.com) and would like to keep the cost to a minimum (I don't fly all that often).

I am wondering what people recommend for an affordable portable power supply, that accepts USB?

Thanks for your time.

- Brennan