Definitely don't use sand...they're too small! What size tank do you have?...tiles probably won't fit exactly so you'll have to get them cut, or get vinyl ones and you should be able to cut them yourself with scissors. I don't know about the light thing with glossy tiles...but they're definitely slippery...so I'd avoid them unless you want to sand them... As far as where you can get tile, I got mine at home depot...and you can get them at anyplace like that and they will have a good variety of choices. Generally each tile is under $2.
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Christina

Leopard Gecko Morph Descriptions
2.3 leos
-0.1 tangerine het rainwater albino w/jungle background (Blinkers)
-0.2 jungles (Vahz & Skissor)
-1.0 tremper albino (Spitfire)
-1.0 tangerine rainwater albino (Bronx)
-ignorance is not to be punished when one is trying to gain knowledge...what scares me is the vast number of people who, when given the information to gain knowledge, choose to ignore it.