You probably know more than I, but I found one that looked very similar to the middle watch for under $500 on Amazon. (http://www.amazon.com/Tissot-T-Classic-Locle-Watch-T41-1-423-33/dp/B000JKSS8M). I've never purchased a Tissot from Amazon before, but I assume they don't vary much from one purchased from a specialty store.
Yes, you can find Tissot very heavily discounted. Sometimes, not always what one gives up with that is getting the box and papers, if that is important to you. Usually you will not get a factory warranty, and sometimes the serial numbers have been removed from the watch . Watches that maintain value over the years have more stringent controls by the manufacture. Dealers who would sell watches to resellers will have their dealer status removed by the manufacturer. So if resale and and maintaining value are important to you Tissot is not for you. But most people don't care, just some of us watch nuts.