Tracy - what you are referring to is simply - sign vinyl. As David said should be cut with a sign vinyl plotter - it contains PVC and most manufactures recommend you do not cut it in your laser - it can produce dangerous gases and cause corrosive damage to your machine - including bearings and lens.
I would suggest you contact a sign shop to find a regional source for vinyl materials or do a web search for sign supplies. We get ours from 4 or 5 different warehouse locations in the midwest but, I am sure there are sign supply warehouse closer to you. You may want to build a relationship with a local sign shop to do the cutting of you rather than invest in machine, materials and software to do this.