All three carriers offer flat-rate shipping options. USPS cannot ship packages weighing more than 70 pounds. Emails, texts and online messaging may have largely replaced physical letters ...

4. Under "Combined shipping discounts," you can offer a flat shipping rule, which would set a base rate for the first item purchased, and then a smaller amount for each additional item.

it will no longer offer free shipping for all orders. Instead, customers must spend at least $50 before taxes to qualify for ...