Leopard geckos are very easy and inexpensive, crested geckos, ball pythons (i know you said no snakes but i love them), bearded dragons are fairly easy but they do get pretty big and need a large cage, pacman frogs are very easy and look very cool in my opinion, and moon crabs, also known as Halloween crabs are very colorful and easy to take care of. An added benefit to these pets, excluding the pacman frog, is that they can be and even enjoy being handled. All of the suggestions in the replies are good ideas i just listed these because I have experience with them.