Rock collecting/flint knapping supplies

I want to do a hunter/gatherer project with my history classes, and it would be great if I could find some obsidian/chert/flint or similar rocks for the students to experiment with. Does anyone know if there are any geological outcroppings of those around here, or even perhaps a store where I could purchase some? thanks.

One of the stores in the Paleo Wonders chain, which specializes in fossils, might have what you’re looking for. (See the bottom of the page for addresses, all in Mandarin.)

i’ve been there and they pretty much only have fossils and quartz crystals, and little bitty rocks that you can put in cute glass jars…
thanks for the suggestion though.