The cheapest most economical and easy to sterilize enclosure that can be used for a multitude of animals and situations is The plastic storage tubs You use to store clothes etc in. You can buy them in all shapes and sizes up to the 120L tubs and prices vary from $5 to $35 depending on where you buy them. I use them for my mice, rats, guineapigs and have seen other people use them for temp lizard homes and snake click clacks! For added security, a couple of pieces of pine cut to fit and fly wire or mouse wire screwed to the top makes a super snug lid. If there is an illness or messy birth No drama's clean up! Fantastic tubs, and they can be made to stack upon themselves and some cross pieces of wood on the lids give ventilation room. You can also buy in bulk for cheaper! Many people use a solder iron to burn holes in the sides for ventilation too if your going to use the lid on top (I'd also use clamps on the lids to ensure slithering friends can't escape too)