Low Budget P90x... typically $10-$20 for the entire package, good if you're not sure you can commit to P90x because of the cost... I have done this half assed a couple times, it's a good program and will work, for me, after a couple of half assed rounds, I'd gotten bored and needing over 100lbs to lose, I needed to amp it up.
have done this 2x..once half assed while doing Body for Life and just recently to coincide with my change to a paleo lifestyle. This really does work (see my blog before and afters) and I HIGHLY recommend it, just watch out for the bootlegs, many are very subpar in quality and make sure you're familiar with the sellers if you use amazon. I almost got hosed until I made sure it was sold by beachbody, fulfilled by amazon. Lots of complaints of poor quality, defective bootlegs and there's no warranties on those.
doing this program as a follow up to P90x... don't let people fool you, if you're not feeling it, you're not pushing heavy enough, hard enough, or slow enough. This is 'hell' on a whole new level. I don't notice or care much about the validity of their smiles, I like the various modifications and what I'm being told to do, I don't care who's who or how fake or honest their smiles or grimmaces are. This is a great program that teaches you truly proper form too.