I just checked ebay. Real ones sell for $100-200 US. There are also fakes, most of which admit in the description that they are fakes, and include extremely l

I just checked ebay. Real ones sell for $100-200 US. There are also fakes, most of which admit in the description that they are fakes, and include extremely large numbers like 10^33. The highest number that you can get cheaply and that is not fake seems to be the 50 billion. They sell for about five dollars, which given the economics of ebay is probably as low as you can expect.