Build these stackable sawhorses with the free detailed plans.  These sawhorses are different because they have a replaceable insert made from 2x stock.  When the insert becomes riddled with saw kerfs, you can easily replace it with a new insert.
Build a saw horse for about $55.  This one weighs about 80 pounds so it won't move around when in use.  This sawhorse's height can varied based on your height to give you more control while sawing, resulting in safer sawing.