For FW plants, 3-day mail (I think it is Express Post) works well. Actually I received a plant from the U.S. that took I think 29 days to get here and it was mostly mush but there was some viable plant that grew and survived. Macroalgae I am sure would ship just as well.
The best way is to ship it within a plastic bag with a moistened paper towel inside the bag, you don't need to keep it wet, you just want to keep it from drying out inside. Mail it on a Sunday night or Monday morning so it doesn't spend the weekend in transit.
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