Before there was the miter saw, there was the miter box. An Amazon store has the Stanley 20-800 Miter Box and saw for $36.21. Why would you want one of these setups? That’s easy — because if you have no power, you have no miter cut without one.
The saw is held in a guide to precisely cut angles in molding, trim and smaller lumber. Theoretically it’s more precise than the slotted guide box, and the blade is thinner than a standard miter saw so there is the distinct possibility that you will cut a little straighter — if a little slower.