Go with what works.
-------------------

I'm going to take a secondary marketing approach here and show that this is the way that two top internet retailers (different industries) display their prices. Since one of them is Amazon (and they more than likely to have done the research for this), your best bet is to use the strike-thru and show the original price.

![Amazon.com][1]

![Newegg.com][2]

That being said, *Best Practice* is for the offer to be clear to the user. If it's not intuitive what you're showing because there isn't enough information then chances are people will not see the value.

As I'm sure you're aware there is a much greater problem getting people to see the product and find value in the offer itself for the product in relation to what the customer feels it's worth, vs the actual technical display of the number itself; meaning if it's not priced accordingly for the target market, they'll not likely make their purchase.


  [1]: https://i.sstatic.net/XLT3m.png
  [2]: https://i.sstatic.net/gHaS9.png