A Mystery Auction for a great package at the Serena Residences in Mazatlan, Mexico went for $980 this week. Not only was the identical package available at the same time for $802, but it's now available as an auction item for the starting price of $652. Amazingly, the bids on the Mystery Auction went from $802 (the buy now price) to $850, $965, $966 and $980.

It really is worth spending some time exploring the Luxury Link website to determine the maximum amount that you're willing to bid so you don't pay more than you should.