Amazon has the Opteka BP-SC4000 4000mAh Battery Solar Charger for $27 with free shipping. Features solar or USB power, LED power capacity display, auto-shutoff after charging, and includes 10 charging tips.
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May be 4000mAh, but 3 stars with over 100 reviews, I think I'll pass.
Meanwhile, for about the same price, Amazon has a 1500mAh charger - the ReVIVE series with 4 stars, or the XTG-SOL1500, also 1500mAh, als with 4 stars