~$70 (score: 5/10)
Available directly from the maker Trancedental Technologies. This requires a unique transmitter lead, which plugs into the PC microphone socket.
The latest version includes photo-realistic scenery, an aircraft editor and a full scenery editor to allow you to create either your own photo scenery or your own cartoon scenery. There are a few helicopter models available from the supplier's site, but not really any independent sources.
This is a good budget simulator, with better physics that FMS, but less models are available. However you have the built-in capability to create your own aircraft and scenery. This sim is now often bundled as a model-specific simulator now (e.g. T-Rex) and these models seem to be quite accurate.
Futher information available from www.preflightsim.com.