I've printed at Kinkos so far. It cost me $8 or $9 for enough labels for the 2 batches I just labeled. Those batches are mostly 12 oz. bottles with a total of maybe 8 larger bottles (22 oz.), so it was just under 50 labels. I fit 6 labels on a page, and paid for I think 7 pages. A test page of one of the labels came out the wrong size (ended up being perfect for the 22 oz. bottles! bonus!), so I got 8 pages for the price of 7. Then I got 7 of the other label (I'll drink the few without labels first, before I forget what they are).
If your priority is making beer to save money, printing at Kinkos might not be the best option for you. For me, I enjoy the fact that it is cheaper, but mostly brew because it is fun. I know I can buy better beer than I can brew, for now at least (only brewed 4 batches so far). So, I'm just having fun. Less than $10 spent on 2 batches doesn't increase the per bottle cost enough to bother me.
I just spent $7.50 on a 4-pack of New Belgium's new pale lager, Shift. It tastes great, and is still way more expensive (per beer) than spending money on some fun labels for my homebrew.