It's a matter of conditions where they are typically collected, so like if it's monsoon season or something...
Check LFS to see if anyone can find one for you, since they are considered one of the more difficult to keep, and many LFS are clueless about bacterial infections or cipro treatment, as are many hobbiests, many LFS just do not keep them in stock as they feel it's nearly impossible to keep them long
Expect any gig newly shipped to be in need of cipro treatment, and have it at the ready, otherwise it's usually too late, and I'd guess at least 80% of newly shipped mags or gigs will need cipro immediately upon arrival.