Krylon's H2O Latex is 100% acrylic latex spray paint. And because it's a latex paint, it cleans up much more easily than conventional spraypaints, using just soap and water will get it off your hands (for instance). It also contributes 55% less to smog pollution than most solvent-based spray paints and is safe(r) to use indoors since it is a low odor/low toxicity spray. Currently you can find it in 21 different colors, but their website says that they're expanding that. And like most spray paint you can use it on wood, metal, wicker, glass, craft foam, plaster, ceramic, fabric and paper.
We did a quick search and found that, online, a can goes for anywhere from $3.80-$5.50.