Serexin This will assist in giving you an erection and can increase both your size and girth. Your pump will cost you approximately $40 to $180 depending on your individual needs and the results that you expect. In addition to these newer methods there are older and more tried and true methods of increasing your size by the way of exercises. There are a number to choose from and a little research may need to be done to find the one or combination of techniques that will fit your situation best.