I haven't read through all the responses yet, so this might be a repeat.
My Target sells these nice, big plastic placemats. They are usually in w the holiday stuff, like at Valentine's Day or Easter. I wait until they go on clearance (there are usually still some around at 75% off), and I snap them up for like $.25 apiece. They are awesome work space protectors! I just put one on my craft table, and put my glue gun and coffee cup wood burner
on it, and work away. You can cut on them, glue on them, whatever. Eventually, they get yucky from all the glue after a few months, etc. so I toss it, and grab another.
They are also awesome for craft projects for your kiddos.