if there is allot of snow, it could be as simple as snow, or ice in the back of your rim's. hit the car wash first and make sure you blast out all the rims really good, or take them off and clean them. next cheapest is get your wheels balanced, that could do it. after that, yes, it could be cv's, they usually make noise when you are turning, if they are bad. and after that I would go for wheel bearings. Good Luck!