Can you buy happiness?
Yes, yes you can.
It's already been stated that money can become an end goal, and in that sense becoming the happiness you seek, but money becoming happiness doesn't mean you have bought it. What you can buy are cars, women (or men, I don't judge), and anything else that brings you happiness. No matter how you slice it, to get what you want, it requires money, that's how our world works. Money gets you the things you like, the things that make you happy, money buys happiness every day.