Yes, I mean the ones that cost about $5 and come with the little straws that you can put on the nozzle.
Those cans of compressed air.
Because of one can of compressed air, I was able to get an XBox 360 for $25, along with Unreal Tournament III and Soul Calibur IV (which was an additional $15, but I bought that from another friend).
The aforementioned 360 belonged to one of my hallmates, and had an issue where it would play games, but about ten minutes into the game, it would stop reading the disc (bringing up an error stating the aforementioned error). We just figured the lens was dirty, so I took it to my room, ejected the tray, and attem