making labels - multiple labels to a sheet

I have just about pulled my hair out! I often do up special brochures for events and I like to have a specific coupon code for each event so I can track sales and know what works. This is just plain business sense; if I pay $75 for a bag insert at a La Leche Conference and then don't get one single sale, that was perhaps not a good idea. Of course, it's always possible that it was a success because it got my name out there and people now see my business as credible and bought at some later point without the coupon. But still, I like to see some sales.

So, I got this brilliant idea to buy my flyers in bulk and then print my own labels and stick them on. I designed my flyer with a nice empty space and bought clear labels 18 to a sheet for a great price. All good. And then the fighting started. The labels came with a template and I had a grand old time designing in PhotoShop. And when it came time to print, no matter what settings or program I tried, only the first few labels lined up. There was always way too much space at the bottom of the page so the last rows of labels were off.

I contacted Labels Online and they gave me some ideas, but it didn't help at all. Perhaps because I'm on a Mac; the settings mentioned weren't even choices for me. Then it hit me. I just set it up to print 3 rows of labels and I printed each sheet twice, feeding the other end through the 2nd time to print the other 3 rows. Perfection!

Now. I have to stick on 350 labels for an upcoming La Leche Conference! And quickly! The deadline fast approaches!