At Wal-mart they have New Look patterns, they run around 3.50, I think. There's one I've used that is a unisex 1T to 4T wardrobe with pants, shorts, and a boy and girl version of a button down shirt (the girl version has puffy sleeves) as well as a little skirt. I've used it a lot for my kids, as the shirt pattern is very simple and the pants even more so.
Also there are the "It's So Easy" patterns from Simplicity at Wal-Mart, and they are really easy, and run about $2.50 (I think).
I'm sure you can find something.