find a courier who will transport live fish, get a price to quote your buyer, Find a poly box, heat pad, double bag the fish and double rubber band. Place bags into box and pack with newspaper. Label it to show it contains live fish and fragile, this side up etc. Deliver it to the courier allowing ample time so that it is delivered the next morning. Let your buyer know when they can expect the fish to arrive at their address so they can be there to greet them.