So the one on eBay for $48 is a good deal. Any confirmed bootlegs of this version?
Was the one you saw on eBay for $48 the single-sided wilding style that was distributed during the film's original 2008 release or is it the 2009 double-sided re-release? Sorry if this was answered already elsewhere.
If is the double-sided 2009 style, wasn't there a mention that the seller stated it was previously used, if so, more than likely taken/given to him after the theater was finished with it. The most important thing then would be to find out the exact condition because everyone's definition of "mint" or "used" could be something totally different. If he doesn't have actual photos of it, you may want to ask for them. Also packaging is key, so many people are under the belief that putting a poster in a tube, and then capping it shut is enough with regards to protection against damage and it's not, tubes get abused through the postal service, UPS, etc just like any other package does.