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Yes, that’s Freedom of contract, and of offerendum (transliterating legalese here, bear with me). Generally speaking, parties can choose to engage or not engage in contracts with any other party; and just because an item is ‘available’ on a seller’s website does not bind the seller to deliver on a sale, instead they can elect to form a contract only when they’ve acknowledged and confirmed the sale.
We can pick it apart here as an exercise, but initially it seems worth an email asking for the bike at the price they originally paid for it.
Read the terms (i.e. the contract you enter into when using them) of pretty much any online shop. Prices displayed are not binding offers to supply at that, or any, price