def availability(self, dcid, params=None):
        ''' /v1/regions/availability
        GET - public
        Retrieve a list of the VPSPLANIDs currently available
        in this location. If your account has special plans available,
        you will need to pass your api_key in in order to see them.
        For all other accounts, the API key is not optional.

        Link: https://www.vultr.com/api/#regions_region_available
        '''
        params = update_params(params, {'DCID': dcid})
        return self.request('/v1/regions/availability', params, 'GET')
/v1/regions/availability
        GET - public
        Retrieve a list of the VPSPLANIDs currently available
        in this location. If your account has special plans available,
        you will need to pass your api_key in in order to see them.
        For all other accounts, the API key is not optional.

        Link: https://www.vultr.com/api/#regions_region_available