There are two ways to get a real world item digitised so that you can use it in a 3D package or game engine without creating it from scratch: 3D scanning or photogrammetry.
3d scanning involves a way for the camera to measure depth, often using an infrared sensor, while simultaneously recording video. Possibly the cheapest 3D scanner can be made from a Microsoft Kinect camera, plus an adapter cable. Second hand Kinects start from about £12/$20 dollars from places such as CEX or CashConverters. Make Use Of guide to DIY scanners
Photogrammetry can be done with a
It is quite likely that you will need to tidy up the object once digitised, sometimes going so far as to re-topo (re-topology) which involves overlaying the scanned object with a new mesh you create in quads at the resolution/poly count optimised for your game engine. Maya has good re-topo tools.