Why not eBay?
Look for a used analog oscilloscope available at a electronics swap meet or something local. You should be able to find something available in your price range. My first 'scope was a 60MHz analog two channel that I bought for $40 (USD) at a ham radio swap meet.
Build your first function generator. That will be the perfect way to test out your new oscilloscope! There are lots of free designs based on 555 timers or Exar chips that will be suitable. Pick one and just build it.