The bonding hair extension technique is for very short term use such as a wedding or prom. When you just want that little extra bump to your hair, this is the your least expensive option. Here new strips of weft hair are bonded to your own hair (or scalp) with a safe hypo allergenic bond. They can be taken off with oil-based bond remover or will wash out after a few shampoos. Average cost: $40-$75 per row (3-6 rows required).