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If you want them for marker lights, you might take a look at LED covers. They come in red, green, yellow, amber, blue, and clear. They're translucent, so the light shines through and they look like little Fresnel lenses.
I got these from Mouser (http://www.mouser.com/search/Refine.aspx?Ne=1447464+254016&Ntt=*clb300*&Ntx=mode%2bmatchall&Mkw=clb300&N=1323038&Ntk=Mouser_Wildcards). These might be a bit small, but they have other sizes as well. They're only about 30 cents apiece.
I got these from Mouser (http://www.mouser.com/search/Refine.aspx?Ne=1447464+254016&Ntt=*clb300*&Ntx=mode%2bmatchall&Mkw=clb300&N=1323038&Ntk=Mouser_Wildcards). These might be a bit small, but they have other sizes as well. They're only about 30 cents apiece.