I made a chart on the computer (is that geeky or what?) of all the needles I have. I carry it with me so I can fill in the gaps whenever I have a coupon or there's a sale. The problem for me is that the chain stores (Michael's, Joann's Walmart) around here don't carry double pointeds or circulars or if they do they don't have the smaller sizes. I love having lots of needles because then I can start a project anytime without having to wait and go to the store!