The best place I've found online to find the cheapest solar cells at warehouse prices is on eBay. Basically, what you're looking for is monocrystalline cells. I recommend 3 different types for DIYers:
Tabbed Solar Cells - These cells have "tabs" already attached, which cuts down on the work you have to do soldering them the cells together by about half, and the additional cost is almost nothing. It's real time-saver to look for pre-tabbed or tabbed cells.
6x6 Cells - The standard size for solar cells is 3 inches by 6 inches. However, we are starting to see more and more 6 inch by 6 inch cells, which are twice as big (and twice as powerful) as the standard size. What this means to us it takes alot less work soldering them together, compared to untabbed 3x3 cells.
Unfortunately, I haven't found any 6x6 cells that are also pre-tabbed. I'm sure that someday soon we'll see them, but until then make sure you get either pre-tabbed or 6x6 cells, as this will cut the time and effort of joining them in half as compared to using 3x6 untabbed cells featured in the two videos above.
Broken Cells - If you really want the cheapest solar cells you can find, check out "Broken" solar cells. They will still work if they are broken, you just need to spend more time soldering the parts together. Broken can mean a lot of things...Are they broken in half, for example. Or do they just have a small chip on a corner or two? Be sure to consider just "how broken" they are when considering buying broken cells.
Broken and chipped cells aren't optimal for all systems and have some obvious disadvantages, but because of how inexpensive broken sells are, they are perfect for things like learning and experimenting. For example, use broken cells for a cool project for you kids or a Cub Scout project where they make a battery operated toy run on solar power. This is a great way to have fun and learn something very useful at the same time and may lead your kids to a great future in a green energy career.
Here's a quick video that demos working with broken solar cells. You can see that your craftsmanship or the condition of the cells doesn't have to be perfect to build your own homemade small scale electric power system using renewable energy:
DIY Solar Panels Using Broken Cells:
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I've found that eBay almost always has the cheapest prices on solar cells, often below warehouse prices. Go ahead and browse the options to get more info. These listings are updated daily, if not more often, so be sure to check back regularly to get the best deals.