Laminate documents the simple and inexpensive way. Sure you could buy a laminating machine, but do you really need one? Here’s an easier approach.
Start with laminating sheets that you can cut to whatever size you need. Insert your documents. Then, heat up your iron (no steam for this project). Put the documents on a hard surface and cover with a heavy towel. Turn up the iron to “high” and press it into the towel. Move the iron around the towel, pressing and holding over each area for about 5 or 10 seconds. The heat will melt and bind the laminating sheets, without a costly machine.