Rails - Sep 2011 - respond_with and ajax

Suppose I have this controller:


class SalesController < ApplicationController
  respond_to ?????

  def get_price
    @price = Product.find(params[:product_id]).price
    respond_with ?????
  end

end

1) What do I specify for respond_to() so that get_price() will accept
ajax requests?

2) What do I specify for respond_with() if all I want to do is return
@price?

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