Laserage - Chicago area laser-cutting service bureau. Laserage specializes in laser scribing, machining, drilling, welding, and other custom laser job shop services on alumina, metals, plastics, glass, and most other materials.
Inventables.com - More than 25 color of acrylic are available from Inventables.com. You can also pick up the acrylic in person at their loop location. Email them for details.
Johnson Plastics - Distributors of laser engraving materials and supplies.
Laserbits - Distributors of laser engraving materials and supplies.
Petersen Plastics - Local plastics supplier and service bureau. Good prices on acrylic, also offer laser cutting and signmaking services.