Shipping is done through UPS ground usually on Mondays and Tuesdays to avoid having the plants lay over the weekend in a UPS terminal. Smaller packages are sent through US Priority Mail service and usually arrive sooner with less cost.
Actual shipping costs will be billed after your plants have shipped. This is the only way to make it fair as there is no way to know or estimate shipping costs prior to shipping due to the variables such as location and estimating the weight of plants. You will be emailed a separate invoice for shipping.