centerline 15x3.5 sbp

Trying to get an idea how hard it will be to locate these . . centerline 15x3.5 SBP auto drags . . . .i might pick up a set a rears from a member here . . . ..But ill need to know if the fronts will be impossible to find . . .
Im in southern california . . . 91784. . . . .
Anyone have a set at a reasonable price . . .Thanks