Does anyone have any proofs of purchase from their ti-calcs or graph links or CBLS or whatever. My school is collecting them. If you do it would be great if you can send them to Colin Bartlett; PO Box 446; Bally, PA 19503. Thanks so much guys!! Yeah yeah yeah I know this isn't the place to advertise, but I figured since it's for and educational cause.... Please dot flame me. -Colin :-)