Depends what you want to do with it and how much you want to spend.
A while back I bought a Phoenix flight sim pack, it was obviously not the genuine version based on the price. It included all the necessary leads to plug into the various transmitter makes, a disc containing Phoenix flight sim and a dongle which plugs into your PC USB port.
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As Phoenix flight sim software isn't supported anymore its sort of become abandonware.
Cant remember which version I got on the disc, after I installing the basic version. I downloaded the latest available version off the internet, version 5.0L I think.
Its worked great and cost less than £10 ( $13 roughly). You can even download Flite test models on to Phoenix and try them out.
If you want Real flight its a lot better obviously, but costs a lot more money
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That's $99.99 from Horizon Hobby and probably doesn't include leads or a dongle.