Unless they have changed their mind, Reeftopia does not offer Saturday delivery. Edie said they don't like to ship on Saturday b/c if there's a late shipment, the order won't arrive until Monday. Monday =death day = smelly day. Thursday morning is the last chance for you guy to order, or wait until next week. You should be able to wait until the evening to acclimate the snails into the tank. Just the the snails at a reasonable temperature.