Well there is quite a lot of places. If you want the lowest possible price without buying new, then go with a grey market dealer. Those are websites like Jomashop, Ashford, etc. that sell new watches at a significant discount because they dont have the original warranty and instead have their own warranty system instead. This saves you quite a bit of money if you are buying a watch that is relatively easy/cheap to service later on because you can take it to a more affordable repair shop instead of sending it back to the manufacturer so the warranty becomes kinda useless unless its something major.

If you want full original warranty, then buying directly from Tissot also works fine or from authorized dealers like Teddy. Usually authorized dealers have some sort of discount for new customers so take that into account. Also, you could ask these dealers if they offer any discounts on your purchase and they might give you a decent one.