Thanks for thinking of me. I'm good on these parts but Please post this on KLOV if you haven't already I do know these are impossible to find for people that do need them.
Grayhound (the bus company) can be used to ship items this size reasonably. I used to use them for car parts all the time. The catch is you have to pickup/drop off at a bus stop. They basically just throw it into the cargo area of their busses as they go through their normal routes.
Did some googling and confirmed the Greyhound Package Express service ended in September of 2022.
FedEx Ground/Home Delivery is likely the best option for this. But make sure you pack it extremely well, they farm that service out to subcontractors who can and will mishandle your stuff.