class AWS::EC2::ReservedInstancesOffering

def initialize id, options = {}
  @id = id
  super
end

def purchase options = {}
  options[:instance_count] = 1 unless options[:instance_count]
  options[:reserved_instances_offering_id] = id
  response = client.purchase_reserved_instances_offering(options)
  ReservedInstances.new(response.reserved_instances_id, :config => config)
end