What could be more budget than working out without having to use a gym? I am a big believer in at home workouts (though in the interest of full disclosure, I DO have a $10 per month gym membership... but seriously.. $10..), and through that I've become a big fan of plyometrics and hiit workouts.
Enter the 12 minute athlete. We all say we don't have any time to work out, but you sort of lose all excuses when it's only 12 minutes. And it's free. So if you're looking to mix things up a bit, check out her site. It'll be worth it =)