What can I do about a seller backing out of an offer and cancelling after I'd already ordered?

Today I got a great offer which was over 99% off the BIN price. I claimed it as soon as I saw it, the went to the checkout and payed. About 10 minutes later, the seller cancelled citing "Out of stock or broken". I do not beleive this as I'd just received the offer, why would it suddenly be out of stock or broken? I messaged the seller asking why it was cancelled, and no reply at this point. Was this seller just trolling, and what can I do about this situation?

 

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Move on & find the item from another seller.