def available(self, **kwargs):
        """
        Find available dedicated numbers to buy. Returns dictionary like this:
        ::
            {
                "numbers": [
                "12146124143",
                "12172100315",
                "12172100317",
                "12172100319",
                "12172100321",
                "12172100323",
                "12172100325",
                "12172100326",
                "12172100327",
                "12172100328"
              ],
              "price": 2.4
            }

        :Example:

        numbers = client.numbers.available(country="US")

        :param str country: Dedicated number country. Required.
        :param str prefix:  Desired number prefix. Should include country code (i.e. 447 for GB)
        """
        uri = "%s/%s" % (self.uri, "available")
        response, instance = self.request("GET", uri, params=kwargs)
        return instance