Rockwell RK9002 JawHorse Sheetmaster Portable Workstation - The heavy-duty JawHorse Sheetmaster is so named because it can support a full sheet of 8 x 4 plywood all by itself. There’s no need to call over a neighbor to help you hold a project when you have the JawHorse. Keep your hands free to use your tools instead of using them just to brace your work. And raise your project off of the floor and up to a comfortable working height. 

https://www.amazon.com/Rockwell-RK9002-JawHorse-Sheetmaster-Workstation/dp/B005BTLXI8/ref=psdc_552620_t2_B007VMKI6G

Cost:  $298 includes tax

From Josh Cardenas:  This item would be really useful for holding and working with sheets of plywood - they are so big and awkward to hold! Can be used as a regular sawhorse.