Without knowing a lot more about the type of printer you have, whether it's in color or just black, what kind of paper stock you're using and the quantity you intend to print, I can't say what the cost per page is for your printer versus the cost at a copy shop.
However, the chances are pretty good that the difference in cost per page compared to the cost at a copy shop is no more than few pennies per page. (After all, copy shops have to make a profit.) Multiply that by the number of copies you'll be making. Now figure out the cost to drive to the nearest copy shop (at 50 cents/mile.)
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