Amazon with PowerGen has the PowerGen Mobile Juice Pack 5200mAh Battery Pack for $23 with free shipping on $25+. Features a 250-hour flashlight and can charge the iPhone 4 twice. Similar battery packs go for around $30 to $40.
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I've been using one of these when at construction sites with no power and it has worked well on two phones and an external speaker. Well worth the price to keep everything charged while on the go.