what is a hobbico building mat?...
I have about 6 various sized ones and even a 48" x 96" (4' x 8') version for quilting.... most of mine came from Michael's or Hobby Lobby.... some decades old and the occasional thinner spill had wiped out the grid and ruler but used with a good sharp rotary cutter are all quite serviceable
N0 need to photo... they all look just like the new on line version for any source