Multiple item shipping: Ebay will calculate your combined postage when you combine your purchases. Examples: from 92585 zip to Las Vegas - 10 rhizomes= 1st rhizome $4.95, 2-9 additional are 35 cents each; New York, additional items are $1.35 each. To calculate from your address, go to postcalc.usps.gov/ (8 oz per rhizome). So why not priority flat rate? Our rhizomes are too big to cram very many into a flat rate box.