Species like Porcellio laevis/scaber, Porcellionides pruinosus, Armadillidium vulgare/maculatum/nasatum (and man more), are easy to care for and pretty cheap, I'd just check online stores, the ones that are cheapest are usually pretty hardy as well.

As for the mailing, depending on who you buy from they'll last up to a week in the package, so don't worry

Edit: as for the seller on amazon, I personally wouldn't buy from someone that doesn't specify the species I'm buying, and definitely never buy from someone who's selling THIS (just wtf is a "Roly Poly Farm Tower"?), that is the synonym to dead isopods in two days.