If something normally cost £300 and someone is selling exactly the same item for £100, is this either:

1. OVER half price
2. UNDER half price

Does it depend on text or context or is either correct?

For example, if I was in marketing (which I'm not), and had this as a deal, which would be the correct choice?

Thank you.

If something normally cost £300 and someone is selling exactly the same item for £100, is this:

1. over half price
   2. under half price

Does it depend on context or is either correct?

For example, if I were in marketing, and had this as a deal, which would be the correct choice?