I have the 3M laminator from staples and love it. Yes it is pricey but what I like is that it is a cold roll laminator so you don't have to plug it in and can use as much or as little as you need. That makes it quick to laminate five little .... for a poem or to do a banner to decorate for the season. I figure it costs $1 a page to laminate but for me that is worth not having to take the stuff out to be done. I have both the small and the large and for sure recommend getting the large 12 inch one so you can do a sheet of construction paper in it whereas the small 9" one really only does a regular sheet of typing paper size. On the other hand for the small one I have I also get the roll that puts laminate on the front and adhesive on the back. That is great for feltboard sets because then you peel the backing off and stick it to the paper side of sandpaper #120, and cut out and that sticks really well to feltboard without pulling.

Micheals and other craft stores sell the xyron laminating machines. Not as good as the 3M I don't think but cheaper and you can also get magnetic to put on the back etc. Good enough job for use in daycare.