Just to add, virtually all carriers have added significant extra charges for oversize items over the past year or two. This has hit sellers of golf clubs, fishing rods and similar items really hard, in some cases it has doubled shipping costs. Relevant to people here would be the cost to ship paddles or any tent poles if they don't come in sections that be broken down to shorter lengths.
For USPS Priority, anything longer than 30" is subject to an $18 extra fee.