Where do i find a rotocator - Garden

Hi and welcome to FixYa. I am Kelly.
I think your looking for a planer Rotacator but not sure. Is this what your looking for:
http://www.grizzly.com/products/G1738/images/

http://grizzly.com/products/Rotacator-For-Planers/G1738

This magnetic base dial caliper set will do the same job for much less: (Unless you have an aluminum saw table!)
http://www.grizzly.com/products/Magnetic-Base-Dial-Indicator-Caliper-Combo-pk-/H3022

Thanks for choosing FixYa,
Kelly