I want to use caster oil to repel the moles. I am in kitchen area where can I buy large bottles of castor oil.
Moles in the Lawn
Certified GKH Gardening Expert
Here is a link with information on Mole control.
I would suggest locating product that is specifically formulated for the application in the garden. These products generally do contain Castor Oil.
Most garden centers, home improvements or hardware stores will carry these products.