Payday is thursday. Finals end on wednesday. Fiber is a good way to reward yourself for a successfull semester. There places have things you want.
Copper Moose's Shetland on Ebay whose sample I've already spun, and I love it!
Weaverlady, a small scale kind of place that has good prices on BFL, falkland and shetland.
Remember, you can always sell textbooks for wool!