These small nocturnal insectivores (who get big enough to feed on pinkie mice) can do well in a 20 gallon aquarium with several inches of clean playground-type sand, an undertank heating pad, an overhead nocturnal heat source, hollow log and bark slab, and water bowl. Maximum size is 8 inches. Temperament is very sweet though may be skittish at first. Have been popular captive-bred lizards for decades.
Diurnal desert dwellers that can be set up as the leopard gecko, but must be in a larger enclosure, at least a 55-60 gallon. They also need much higher heat during the day, and a special fluorescent bulb that produces UVB (290-320 nm wavelengths - something that only specially made, and rather expensive - fluorescents can do). Largely carnivorous, adults will eat some plant matter. Most in stores are wild-caught. To 10-12 inches.
Diurnal desert dweller, to be set up as the collared. Babies are cheap but that's because they have a lower survival rate. Buy one at least 6 inches long - big enough to start eating mouse pinks. Smaller beardeds are more difficult to feed, with intestinal impaction from insect exoskeletons and paralysis and seizures-even death-from being fed prey that is too big, all too common. These guys need the least amount of work in terms of taming - they are pretty much big lazy slugs. They do go into a winter slowdown, a period of long inactivity (sleeping for days or weeks) interspersed with a bit of wakefulness, eat a bit, drink a bit, then down again for several weeks. To 20 inches.
These low-slung, wide-bodied lizards look like a giant alligator lizard with skin like your kitchen floor. Like the bearded dragon, these Australian natives are strictly available as captive bred lizards here in the US. Blue-tongue skinks are omnivores, requiring a temperate woodland type of environment, with temperatures in the mid-70s to mid-80s. They need some access to UVB which can be easily supplied by taking them outside with you for awhile during clement weather, and by providing a UVB fluorescent during the winter months. To 24 inches. They like to move about and wander, so a larger than expected enclosure is a must.
These strictly wild-caught, strictly carnivorous lizards are one of the most common of the small monitor lizards. They also have one of the nicest temperaments-when you get them tamed. They are masters of scrabbling backwards in your arms and hands, leaving trails of scratches in their wake. You do need to be careful when feeding them their mice, however-they get extremely eager and easily mistake your fingers for the mouse, so always use tongs. Temperatures from mid-70s to mid-80s with a slightly higher basking area. UVB occasionally. Hissy and thrashy initially, lots of bluff but rarely a bite. Once tamed by an adult, are usually suitable for handling by middle childhood age kids. To 4 feet. Good climbers, they need large, well secured enclosures.