Amy~
I remember Staples had a 1/2-price sale on their B/W copies last August. As such, copies were "only" 5 cents each. Hopefully they'll have it again next month.
I have gone to Office Max, only because I had received a 15% off coupon for printing services. I had received it in the mail because I have one of their Teacher Reward cards. (Make sure to sign up for one because you get a $10 reward for every $75 spent in qualifying purchases!) At the Office Max I go to, B/W copies are: 10 cents for 1-75 copies;
9 cents for 76-250 copies;
8 cents for 251-750 copies.
Color copies are 49 cents each, regardless of how many copies you get.
At Staples, I was told B/W copies are 10 cents, and for 500-1001 copies, 9 cents. Office Max seems to have a better deal. I haven't checked at Office Depot or other places yet.
I'm like you---looking for the best cost-effective method of copying! I would love to have my own photocopying machine here at home! However, I don't know if I can afford the price.