There are always comps, regardless of the type of real estate. Land can be more difficult, especially if vacant or raw land with no improvements. If you are looking to purhcase or sell, it may be beneficial to you to contact an appraiser to assist in determining a selling or purchase price. In some instances and type of real estate, one has to go farther out (distance from the subject property) and/or farther back in time to find comps. With land, sometimes it is necessary to choose different size parcels as comps. Whether the comps are farther away, larger or smaller, and/or older sales, there are necessary adjustments that need to be made to determine the current market value thereby enabeling one to determine a reasonable selling or purchase price.