Are you interested in taking $130 for the poster? Do you really thank it's worth more and you're willing to pass up this offer, or are you willing to risk that you won't get a better one through auction?
If you're that afraid you could always just end the auction, saying it's no longer available (hey, everyone will think you sold it anyways). And then try again later when you think the interest is greater. Who knows, when the right people are watching it might be worth your original $250.
So ultimately, is $130 for it now better than the risk that it won't sell for that much? Then again, if you're in no big hurry, like I said, just end it now and list it again in two months. You never know how quick things can change sometimes, considering the auction business is directly based on who's watching when.
