Hi, last time I shipped anythig like this out, it was around $5.50 for a small USPS priority mail box to be shipped anywhere in the US. I will be stopping to the post office tomorrow to confirm prices.
Please note, I have gotten a few messages with people planning smaller tanks (under 30gallons). I would like to warn you, these plants grow quite big under the right conditions. They can even outgrow a 100 gallon if they're REALLY happy. My plantlets from last season are alreay outgrowing my 35 gallon tank (no, I do not use Co2. I use a subsitute, excel.)