Your local coop! The thing with drop spreaders for ag lime, all of us want one, but big picture says once you get your ph where you want it, you will likely only use it once every 3 to 4 years to do maintenance lime applications. As I said everybody wants one, but having a piece of equipment that sits in the shed more years than not could be looked at as a poor investment or waste of storage space. If you really need(want) one, as batman stated, EZEE-FLOW is really good stuff, as are others that use a similar design. JD LF10 and similar models(like Gandy and IH) are very good as well. Used off CL is the way to go( just check it over good), but if you happen to be driving by a farm and see one in the weeds by the fenceline, don't be afraid to stop and ask if it is for sale, many farmers nowadays don't want to dink with spreading lime themselves and hire it out to the coop along with their fertilizer application needs.