Just as the butt and boob fillers have gained popularity in recent times, the demand for penis fillers is also on the rise and here’s how much they cost. Penis fillers are designed to increase the organ’s girth. The procedure is non-surgical and involves injecting liquid into soft tissue under the skin of the shaft. increases a man’s girth. The Procedure costs 3,500 Pounds and last a year or a year and a half. A lot of men are going in for the procedure as about a 130 men come in a month.