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Shipping is always free worldwide and from previous purchases the used books are pristine or they will instantly refund you. I have only ever had 1 problem with a previous book and they refunded the difference from that order. Great site.
Used to frequent betterworld quite regularly, but then found that new copies from Bookdepository etc were often within a few $s of BW's used copies. Still a good deal - Just note their shipping is free, but can be PAINFULLY slow - Like 4 weeks +.