https://www.ebay.com/sch/i.html?_nkw=Porcelain+Gridded+Dry+Erase+Board+24+X+36+&_sacat=0&_dmd=2

Porcelain Gridded Dry Erase Board 24' X 36'

Regular price
$169.00
Sale price
$112.00

Create your own customized system - just add magnetic accessories (sold separately) Features a magnetic dry-erase porcelain surface and an aluminum frame. 1in. x 1in. blue grid pattern is fused into the board. Mounting hardware included for easy hanging. Magna Visual 1in. x 1in. Made by Magna Visual.