Don't use paper mill "slag." Ag lime hasn't gone up to my knowledge. Delivered rate may have gone up, but not the lime itself. Least expensive, but still good, way to do it if you have a lot to cover is: (1) have ___ tons (the amount you need) delivered and (2) dumped in an area you can easily load a buggy, but you aren't worried about growing anything, (3) get the buggy from whomever delivered it; (4) Use tractor with large bucket to load buggy; (5) drag buggy with tractor.