@Mop it upYou won't be able to just return them to Target or Toys R Us, but I imagine there'll still be a solid secondary market for used Amiibos. My local game stores sell secondhand Skylanders and Disney Infinity figures; I figure used Amiibos will be joining them soon.
Does anyone know if Amiibos come with Club Nintendo codes? It'd be cool if you could register and get coins for them just like games.