Appearance of touring bikes on ebay is a random event; some weeks several, others few. What is your price range? I've seen a number of decent bikes listed on ebay for a few hundred dollars (<$400) that could work as tourers, and then there are dedicated touring bikes and sometimes those do sell for more. If you are willing to convert an old mountain bike into a tourer, then you can find one of those for less. If your budget is around $1000, then I'd recommend getting a new Surly Long Haul Trucker.