Acrylic: Total Plastics Int'l - www.totalplastics.com/ - Local plastics manufacturer with cheap prices and low shipping cost. Must buy in 4'x8' sheets (16qnty 12"x24") but they'll cut it to size for reasonable cost (Matt Weightman)
Acrylic: McMaster Carr - www.mcmastercarr.com - With quantities over a certain amount, shipping is free which makes it cheaper overall (Pete Pratt)
MDF Sheets: Home Depot - Need picked up and cut down to size on a table saw, but much cheaper than paying shipping on 4'x8' sheets. (Pete Pratt)
Vinyl and Supplies: Grimco - www.grimco.com - Local supplier with wide variety of Oracal Vinyl, and quick shipping. (Pete Pratt)
Heat Transfer Vinyl: Heatpress Nation - https://www.heatpressnation.com/ - Good prices on Siser Vinyl with large selections of vinyl types and colors. (Matt Weightman)
Vinyl Cutters, Heat presses, and Vinyl: US Cutter - www.uscutter.com - Good prices on equipment and supplies, including their own brands. (Matt Weightman)
3D Printer Supplies
3D Printer Filament: Amazon - amazon.com - Large selection and cheap prices. *Amazon brand filament spools do not fit the Flash Forge 3D printer because of diameter of spool (Pete Pratt)
CNC Router Supplies
MDF Sheets: Home Depot - Need picked up and cut down to size on a table saw, but much cheaper than paying shipping on 4'x8' sheets. (Pete Pratt)