The rosetta stone deals seem too good to be true. Does anyone know anything about this website? Is it legit?

You're right to be suspicious. There are loads of these, this one is in Malaysia but they're all over. Companies like Adobe aren't in the habit of supplying their software to people who are selling it at below the wholesale price. If you get anything for your money at all, it will be a pirated copy which may or may not be fully functional. No customer support, no manuals and probably no future upgrades either, if the serial number has been compromised and the manufacturer knows it. You just saved yourself some money, well done!