I recently snagged Altered from Hastings for a discounted price (it was used).
Basic plot: A group of friend capture an alien some years after a friend of theirs was killed by one. They hold the thing in a compound built by one of the friends, named Wyatt, and plan to kill it, but Wyatt claims doing so would only make things worse.
Not a bad movie, all in all. I liked how the first half of the film was a steady stream of the situation getting worse and worse. The last half of the film isn't as impressive, but still worth watching.
Worth a rent, at least.
We discussed this movie back in December.
http://www.badmovies.org/forum/index.php/topic,112192.0.html