Do you have a PetSmart store near you?? They carry Dwarf puffers in many of their stores, if they dont have them, they can probably get them in for you- Talk to the Fish Dept. Manager. They are inexpensive there, too- $1.99 ea.

Just make sure that they are eating prepared food, unless you plan on feeding them brine shrimp or frozzen food!!

There are also online stores that sell puffers (try LiveAquaria), but they generally stock the brackish critters. Shipping can be a bit high.

Andrew