Well, if it was Ebay I'd be worried, but with OfficeDepot it's probably just a case of dumping discontinued products. You do have to be careful -- all chemical film has a limited shelf life, especially if it's not kept refrigerated. Polaroid film in particular I can recall being sensitive to heat (you'd end up with these washed out, pink-tinted pictures). While there should be a production date (and probably a "use by") date on the package, you have no idea where it's been or what conditions it has been exposed to between then and now.
Then again, if the whole reason you want to play around with Polaroid is for the aesthetic possibilities
, maybe you don't care. Shoot a test picture and then try to find a way to work with the spoilage, taking advantage of whatever color cast or other strangeness you get. Polaroid offers all sorts of opportunity for analog expression -- pressing it with objects (even just your thumbs) while it's developing can give you interesting results, and there's a whole sub-genre devoted to abusing the film
in various ways; the results can be fascinating
By the way, these guys
apparently took over / rebuilt a production line and are supposedly producing new Polaroid film to sell into that niche market.