There is no way to do this when ordering online (presumably) or on automated phone lines, but I wondrr if the OP has tried actually speaking to a live order rep and asking to split the payment. Most B&M businesses do not *say* they will do it, i.e. specifically "advertise" it, but they are happy to do it. I suspect they (any business) wouldn't be thrilled to do it on a $75 item but would happily do it on a $200 item.
Life without Mexican food is no life at all