In my experience, unless you're spending decent money you won't get a decent instrument, second hand is always the best value for money but you've got to hunt. Go to a music shop, ask for one thats good for beginners, any reputable music shop will be able to advise you on it and a good place to get lessons.
(Trust me, you'll need lessons, better than any crappy book)
Don't spend the money until you're sure you'll get the use.