noun, noun which may take the genitive case particle 'no'
Used for prices, costs, or values that are exactly or approximately half of the original amount. Often appears in commercial contexts such as sales, discounts, and comparisons.
You can buy this item at half price.
It was marked down to less than half price.
The clothes went for half price during the sale.
I bought the older model computer at half price.
The stock price fell to half its original value.
半分 means simply 'half' of any quantity, while 半値 specifically refers to half of a price or value, not a general half.
Compound of 半 (half) and 値 (price, value). The reading はんね is a regular sound change from はん + ね (rendaku does not apply here).