Nope, not a typo. lol I've currently got a few P.expansus "Orange" individuals that I'm trying to start a culture with and a couple are already about 1 inch (not including uropods) and they're only slightly over half way grown.
The various Spanish Porcellio spp. are the largest you're going to find with Porcellio magnificus standing on top at 2 inches or slightly longer. Porcellio hoffmannseggi, Porcellio hassi "Super Giant", and Porcellio expansus "Orange" are some of the other notably impressive Spanish isopods as far as length goes (although nearly all of them are larger than the biggest species that can be found in the U.S lol) .
Also, yes, all of the aforementioned species fetch $100+ per 10 individuals.