They are 38 a piece. Bigger reason is that a smaller diameter blade will cut through straw better so I don’t particularly want to change them. Might see if I can source 18” ones with the proper bolt pattern maybe. Mine were all brand new to start this past year.We change blades every year on our Deere’s. They are 28$ a piece and brand new and sharp to start every year that way. Are the BG that expensive guys try to run them for 3,4,5 years? Cheap easy way to make drill seed well is new discs.