Have a look at the colored plywood blanks, they're different.
I just had a package delivered today, got a orange plywood blank and a red plywood one, plus some pippy yew ones.
Got them from Phil scarlett arts.
I done a blue and grey plywood slimline for a work colleague, came out really good, got some interest from other people for similar pens now.
So might be good to add to your craftfair selection.