I really liked spider tortoises (Pyxis arachnoides), they are small (less than 5 inches) and very hardy. They are also reasonably price as well on kingsnake.
Other small tortoises to consider:
Egyptian tortoise (Testudo kleinmanni)
Greek tortoise (Testudo gracea)
Indian star tortoise (Geochelone elegans)
***The above tortoises ranges from $100 to $500 each for hatchlings****
If you are willing to spend $1,000 for each tortoises consider the following as well:
Flat-shelled tortoise (Pyxis planicauda)
Burmese star tortoise (Geochelone platynota)
Chaco tortoise (Geochelone chiliensis)
Impressed tortoise (Manouria impressa)
All the above tortoises are between 5 inches to 10 inches maxed.