The cheapest US brand is Kaneka, available through Sun Electronics, with a cost of $1.2 / watt. Other vendors also sell Kaneka products that are around $1.37 – $1.8 / watt.
Keep in mind with cheaper solar panels, there are other factors that are given up. The $1.20/watt panels sold by Sun Electronics, the Kaneka GSA60 are heavier than the crystalline silicon models. They are thin film and give off 60 watts, and a minimum of four panels are required for purchase.
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