The transaction is between you and the seller. whether you can get your money back depends on how you paid. However it's much safer to be sure about the seller before you bid

If you were happy with what previous customers have said about the seller (e.g their feedback record), which their terms and conditions, selling history and any other information they have provided about themselves as a seller ( e.g their 'all about me' page). The quality of the listing satisfied you all was in order, good description, original photographs rather than stock photos etc.. , the speed the answered questions placed on their listings, the choice of payment methods offered ( for high valie items, you could consider using escrow) then it'll probably be e very succesful transaction.
If you were not sure about the seller, then the risk is yours. Can I ask what persuaded you to bid?