I met Zach Kaplan on-line recently, then setup a meeting at Maker Faire. He runs very interesting web store to supply raw materials to fabricators. The store is called Inventables and has been operating for about 10 years.
They sell a lot of laserable materials, like over 50 colors of acrylic. He is actively getting more laserable materials all the time and would probably be open to any suggestions you might have. They specialize in shipping out low quantities to fabricators same day.
http://www.inventables.com/