Exercise Equipment For Home

I have a budget of $ 400. I am interested in losing weight (40 pounds) of energy resources and some tonic. Confused by all the different types of equipment available, not sure what is best for my needs. Treadmills, exercise bikes, elliptical, etc. I have seen so many ads and NordicTrack Bowflex, but I think I'm out of my reach. Winter is coming soon and I know you do not have the power to make the feet or pay money to go to a gym every day, I know very well. I like to stay at home anyway.