Hobby solar cells are available from a number of on-line outlets, including RS, Farnell and Maplin (usual disclaimer) at easy-to-afford prices.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
You can get cheap solar powered lights and such like from the cheapo catalogues ..they can be canibalised for parts. I have one in my garden shed...completely useless as I don't do gardening at night!
What sort of projects? can we all play?
Del
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health warning: These posts may contain traces of nut.