Thanks, all! That was helpful. I had thought that the compost I was planning to use might be too rich for tulips, because the runners would have left nitrogen in it. I certainly agree that tulips don't need to start off in rich soil, especially if they're going to be discarded the following year. I find it difficult to make a decision on whether to buy new or not each year. I don't like wasting them, but I want them to be utterly their best, too! The profs. seem to be divided on this.
When I went to the Eden Project a few years ago, I was surprised to see a mass of them, looking absolutely gorgeous, in the smallest pots you could imagine.