Depends but a nice condition N64 with the cables and expansion pak is probably about $100 without a controller. If you plan on connecting it to a modern TV, you need a decent scaler that can do Svideo/composite, so another $60 for the RAD2X. You even can complicate it more by throwing in cheaper RGB mods if you have a compatible system but that adds probably around $60 if you can't do it yourself.

Their price point is very competitive, especially considering its plug and play.