I am arriving in Paris next week (YAY). I was hoping to book a day trip to Brussels on the Thalys, but somehow I lost track of my planning and now ticket prices are way to expensive for a trip. Do you think there is any chance that the fares will go down or that I can book a reasonably priced fair when I arrive (leaving about 5 days after arrival)? Or, have I pretty much missed out on the bargain fares? Looks like I may be making alternative plans for that day trip if I can't find a cheaper ticket.