Sale tables first, then whatever my newest interest was. For a while, I was collecting florals, then homespuns, then it was purples, then greens, then civil war fabrics, then blacks, then golds and yellows, then large prints, etc. But now, it's strictly on a need to use basis. I'm only buying fabric if I absolutely need it for a project that I'm working on, if I can't make do with something from my stash. My stash is so huge, and I'll never use it all, so I decided that I should quilt buying arbitrarily just to make my stash bigger. I miss it though!