Mesh is awful for snakes. It's ok for chameleon cages, but that's about it. Not only is there the nose rub issue, but there is the problem of *too much* ventilation, which leads to drafts, humidity problems, and improper temperature control. If you absolutely must save money, get an aquarium with a locking mesh lid, or better yet, don't keep a snake that you can't afford to properly house.
- Ken LePage