$25 - Yakima 2" hitch rack: this has space for 4 bikes but a couple of the straps broke and currently can only accommodate 3 bikes. You might be able to source replacement straps from Yakima or Rack Attack. This is a top tube "hanging" style not a tray style rack so won't work for some bike frames.
FREE: Saris Freedom Spare Tire 2 - this mounts to the spare tire on vehicles like Jeep Wranglers. Unfortunately, I forgot to remove the mounting plate before selling our Jeep so you would need to source a replacement (or make one!).
FREE: Yakima roof rack cross bars - these are older round cross bars.
Let me know if you're interested or have any questions.