select * from ebay.auctions join pricegrabber.good_prices on auctions.product=good_prices.produce where product in (select game from cnet.best_games) order by buy_now_price;
This is type of query is not supported yet , but I wish every such web store can be federated using Teiid - the world will be much simpler in this way.
You are just two more translators away . Good Job!
On serious note, it goes to show how easy to pull together/manage data from completely different systems in consistent manner using SQL.