Right now there's very high demand for a European DLC item known as the Shaved-Ice Lamp, which you can download at "Game Mania," or by changing your router's SSID to "_The Cloud." It isn't orderable in the catalog, and right now it sells for anywhere between 1 million to 2 million bells on most trading forums I've seen. I recently bought one for 1.6 million.
Plus, if you create a second player in your town, you can get another Shaved-Ice Lamp. Then you can delete that player, recreate them, and so on to get an unlimited amount of Shaved-Ice Lamps. This DLC is discontinued on Sunday, so it'll only rise in price. Just a heads up!
(Also, if any of you European users are willing to hook me up with a few more Shaved-Ice Lamps, I have tons of stuff that I could give you).