multi price in drupal commerce in drupal 7
Commerce Multicurrency module enhances some of the multi-currency capabilities of Drupal Commerce. You can show two or more currency for a product and check this video tutorial and this one


  Current features:
  
  
  UI for fine granular definition of exchange rates.
  (Every currency combination can be defined separately if needed)
  Synchronization of currency exchange rates directly from the European Central Bank (ECB).
  UI to specify which rates shall be synchronized and which are handled manually.
  Generation of currency specific price fields inclusive generation of rule-set to handle them.
  hooks for easy integration of custom currency exchange rate sources.
  




this tutorial will help you without sync http://mcaleaa.wordpress.com/2012/04/08/drupal-commerce-multicurrency-recipe/