Technically speaking, money doesn't buy you happiness. Earning or acquiring money usually brings you some happiness because it represents future goods or services you can buy. After that, you have to purchase goods or services, which may or may not bring you a second round of happiness depending on how wisely you purchased. But even for the savviest shopper, there's nowhere I know of that sells happiness directly; I think we'd have to wait until Matrix-style machines that interface directly with our spinal cords come out.
Nevertheless, I eagerly await a demonstration on your part and will forward my bank account details to you by PM forthwith.