The cheap prices are the starting bids placed by the seller. The game you saw for $9 will probably end up selling for $10-$20 after bidding, and depending on the popularity, ect. I've seen items that start at $2 and end up selling for $405.50 after a bidding war.
As for the trustworthiness, it'll never be 100%. The best way to be sure is to review the seller's rating and comments (if one out of 300 buyers gives them a scammer comment, I don't buy). eBay will recodnize sellers that are known for their good reputation. Usually they do this by giving them titles like "power seller" in a star, or something like that. Be wary though; it'll never be 100%.
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