I'm interested in buying official Japanese-language anime scripts from Japanese online auctions, Japanese online shops, eBay, and/or American websites. How often are they listed? If I see one, do I need to act immediately because the chance of coming across it again is extremely low? If it's not my favorite episode of the series, should I hold out and wait because other episodes' scripts will likely go up for auction at some point (say, within this year)? Or is it more likely that the one I see is the only one I'm going to be able to get my hands on?
I'm particularly interested in Sailor Moon scripts which date from the late 1990s. How many copies of these were printed?