2 day priority mail (usps) for up to 2 pounds is $4.90
That would be 1.5 cups of water + snails in a bag with some air that would fit in a small square box.
Maybe use a water conditioner which has "ammo lock" in it.
I will take as many as will fit without exceeding 2 pounds total weight (box, packing materials, water, and snails).
I'll paypal you $5.75 [shipping and packing materials] at the end of the week (ship snails on monday) if this seems satisfactory to you. Just PM or email me with your paypal information.