I just found one at a fabric store yesterday, finally! I've looked forever and never found one. It is called Add-A-Quarter and I also got the Add-An-Eighth. The address on the packaging is CM Designs, 7968 Kelty Trail, Franktown, Colorado 80116, (303)841-5920...no website on the package. It's the lip that makes it earier to use than the regular ruler.