Check ebay on a regular basis. You can often pick up really good GIA MK5’s and MK7’s for a few hundred bucks. I’ve bought at least a dozen of them and they often throw in a bunch of other gem tools with it. I outfitted 6 offices with basic tools just from the extras that came in with the scopes. Try to find ones with American Optics(AO) or Reichert zoom optics. They are the same company and often labeled with both. I’ll take older AO optics in a MK5 body over most of the new scopes.