You can buy a pack of series one amiibo cards for a chance to get her (these packs are sold at any given store like Target or Walmart, but also on Amazon, eBay, or Etsy); otherwise, people sell amiibos separately or even make their own. If you buy her individually, she’ll run you anywhere from $2-10. A pack itself can cost $4-12 dollars, depending on where you buy them. You can also trade for her card if you have another card someone is looking for; there are plenty of groups where people post daily on wanting to trade!