If you have children, chances are you have a video game console in your home. My daughter saved up her money 2 years ago and bought herself a Nintendo DSi. She loves it. As with most video game systems, those darn games are super expensive. Don't buy new.
For birthdays and holidays, I take my daughter to Game Stop. They sell new and used video games. I taught my daughter that she could spend $30 on 2 used games or $30 on one brand new game. She has always gone on to purchase the used games instead.
Game Stop has a 3-day return policy. If we take the game home and discover that it doesn't work properly, we can bring it back for a full refund. Most stores offer this same policy.