Cutest thing in the world?! (under $50)
There are about 50 suggestions, but my favorite is this one:

Makkuro Kurosuke are tiny soot creatures with big blinking eyes. They pop up in all of Hayao Miyazaki's beautifully animated movies, slinking nervously out of the nooks and crannies of abandoned houses with a shivery "sssssh" noise, only to swarm back in if someone enters the room.
Although shy they're good workers, and can be coaxed into transporting lumps of coal across the floor for the small fee of a sprinkling of Lucky Charms.
Just don't startle one, or it's liable to fall to the floor with a pitiful squeak and disappear in a puff of soot.