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Based on some scant knowledge of photovoltaic technology, I understand that "multijunction" cells, particular those made from Copper Indium Gallium diSelenide, are the most efficient kind today. But by Googling, I cannot find any "multijunction" cells for sale.

What are the most efficient solar cells available today for me to purchase in quantities of 1-10? Types? Manufacturers? Brand names? Vendors?

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Shopping questions are generally off-topic. As a side note, the people who care about maximizing efficiency are space applications - everyone else is trying to minimize cost per watt. – W5VO♦ Aug 24 '12 at 3:54
See answer here – Russell McMahon Aug 24 '12 at 4:20

closed as off topic by Brian Carlton, W5VO♦ Aug 24 '12 at 3:54

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