This fabric is exactly what I used to use when I took accounting in college. You might not want a whole quilt out of it but I'm sure it would be useful.
http://www.penningtonquilts.com/cgi-...&pid=1#14-3056
I found it using this site:
http://www.quiltshops.com/
I use that site a lot to find fabrics on sale. Once you know what you are looking for you can often find quite a difference in pricing and shipping charges.
Good luck!!