It's a weird situation with Xenobade. Basically, it was ONLY sold through Gamestop in the US. Then, after the game became a hot collectors item, Gamestop magically found tons of copies and started selling them at 90 bucks a pop (50 US was the actual price). Gamestop said that was because the game was so rare. However, there is a lot of speculation that these games were actually new copies.
http://www.nintendolife.com/news/2013/08/gamestop_accused_of_re_printing_xenoblade_chronicles_then_selling_as_used_for_usd90
Long story short though, Gamestop is probably fucking you over a bit, but the game will most likely work. And, Xenoblade is a fantastic game well worth buying.