air walker or gravity strider (st ives near warners park)

Im looking for the old style of air walker, or gravity strider, doesnt have to be pretty, just basic functionality. Due to age I need one with a bar across the front to hang on to, where you put feet on the footplates and move it yourself, not eliptical but swinging them back and forth, Due to health it wont be used for proper exercise but just to try and get legs stronger to prevent falls or trips and of course maintaining if not improving things. Happy to make a donation to charity or this site by way of thanks.