If you received an order confirmation number from the vendor of the swimsuit that you have written about for a set advertised price, then you are entitled to purchase that item at the agreed upon price. The vendor is not legally allowed to change the price after the fact.The vendor is not entitled to the additional $60.00 it now wants. I would write the vendor stating the agreed upon sales price and expect performance of the deal within a reasonable time period.If the vendor refuses to comply, your recourse would be small claims court.