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.
この商品は半値で買えます。
You can buy this item at half price.
The clothes went for half price during the sale.
半値以下に値下げされた。
It was marked down to less than half price.
型落ちのパソコンを半値で買った。
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).