material is cheap, the hauling is the expensive part. I used to go rent/lease a dump trailer for a day, make as many trips to the quarry, then home to dump, as many as possible and still return trailer end of the day and then work the material the next day/weekend. I think the rental was around $150/day and the material was about $40-50/load (about 5 yards) ...
That sounds about right to me, I thought caliche was $10-15 a yard. As everyone has noted, delivery is the $$$. PMK was wise to rent the trailer.