Ya I knew the sliding lid ones were more expensive, but thats ot why I don't want them. I don't want them because they don't hold humidity well, so I wanted the ones without the lids and just make my own lids.
i get mine at an aquarium store for 8.99 and make my own lids.
the lids are very easy to make, i get the supplies from home depot
a couple of pieces of wood, a roll of metal mesh, and a staple gun
with the roll of mesh i buy you can make about 4 or 5 lids for a 10 gal tank