I found this item for 200$ online, is it a scam?

If you search Star Adventurer 2i in the classifieds you can see other listings. Most are between $200-$300, so the price doesn't seem off. The only hesitation I'd have is that it looks like the account hasn't listed anything in two years. One of the ways scammers seem to get access to Cloudy Night's classifieds is to obtain access to dormant accounts. That said, you could ask the seller for a photo of a specific part, like inside the battery cover with 1 battery inserted or something that would be kind of odd to normally do to ease your mind.