That's an awfully tight budget to get a decent laptop to run a newly released game, even one with lower requirements like TS4. Moreover, the chances of finding a laptop in that price range that will run future expansions, let alone the base game, smoothly is even slimmer.
You need a good processor, preferably a dedicated graphics card, enough RAM and the like, which would be very hard to find in a laptop at that price range. Maybe you could look into refurbished laptops and see if there is anything that fits the bill.
As mentioned before, with a desktop you could upgrade to the above and still stay within your price range, but with a laptop it's quite difficult, if not impossible.
I would recommend trying to wait a bit longer and save up more for a decent laptop.