Just got back from the local Target. Got two office chairs for $19.99 each, eight rolls of paper towels for $5.50, hand soap for $1 a bottle... good deals all over the place.
During the making of a movie, I spend a lot of time worrying about the cost of film stock, props, lumber for sets... and it's easy to forget about all of the other stuff you need. Like paper towels and hand soap. A penny saved is a penny earned, especially when you're making an epic sci-fi/horror movie on a tiny budget, so it's a good idea to keep an eye out for bargains on the less-obvious items that come in handy on the set when the camera isn't rolling.