Just FYI, I edited out your link for two reasons...one because we're really not big on linking to specific sellers on here. If one of our members gets burned by someone another member recommends, it causes big issues. Plus, we have many members here on the forums that sell various products, feeders, etc and it's not fair to plug one person and not another. The other reason that I edited it out is that particular person you linked to is a known thief and even I have personally experienced issues with them taking my money and never sending the product.
What I recommend is searching the classifieds here and on some of the other reptile forums for isopods. A google search would probably be helpful as well.