Although I'd imagine pickleballs are also made in Asia and thus subject to similar shipping issues, but maybe they last longer than tennis balls so you need fewer of them?
The "good" Pickleballs, Franklin and Dura, seem to last a few to several days before cracking or warping while the "bad" ones that nobody wants to use because they are softer seem to last forever. It's a bit better than tennis where people want a new can every time they play. No shortage in Pickleballs that I've seen so far.