Definitely only buy what you absolutely need for the class. Check out different types of rulers to see which are best for you. I can't see well on the ones with yellow lines but am very happy with the Nifty Notions Pink and Teal by Kay England. I just recently purchased a rotary cutter and the rulers from TruCut. I have been looking at them for some time online because I bought their electric rotary blade sharpener. BUT I wasn't going to buy them til I tried them. I found them at a store when I participated in a shop hop and found both DH and I like them very much.