It is hard to say exactly how much shipping a 20 lb package will cost, since shipping costs change often, and they depend on many factors.
How much does it cost to ship a small mailing tube via USPS? - Quora
Cheapest Way to Ship Heavy Boxes & Large Items
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Buy a 20ft Shipping Container - TargetBox Container Rental & Sales
UPS Announces 6.9% General Rate Increase for 2023 (Clone)
How much does it cost to ship a book to USPS? - Quora
I bought a 20 lb box of basswood from Rockler. This should last me a while. : r/Woodcarving
How much does USPS shipping cost in the United States? - Quora
Shipping from the USA to Germany: Costs, Advantages, Providers