I have delt with this situation for a long time...As far as people walking in while in session...I have had to interupt sessions many time to sell GC's. especially durring the holiday season. I am fortunate in that my clients encourage me to take care of the sale, as they want to see me prosper, However, I felt it basically ruined the flow of my treatment and that it gave the impression that my future business was more imprtant than my current (ie: client on the table).I have a receptionist now, but I found a FABULOUS solution that I am happy to share with you all...Of course this all depends on your location, so it may not work for you.I really wanted to grab as many GC sales as I could, and being a procrastinator myself, I knew that there had to be others that waited until the last minute to buy gifts. So I set up my "After Hours Gift Certificate Sales", and it works wonders!First I bought a white metal mailbox that has a flip lid top and mounts to the wall. I put a sign on the out side that says "Gift Certificates" in HUGE letters. I screwed it into the exterior of my office wall, to the left of my door. I take 2 GC's, one for male, one for female. I put special # series on them, and keep a log for after hour GC's separate from normal sale GC's. I put one GC, with it's envelope - BLANK for them to fill out- and another plain env. for them to leave payment. In the envelope I put a form for them to fill out...who the GC is for, who bought it, how much, the date it was bought, and a number where they can be reached. I put it in a zip-lock baggie, and mark it with BOLD MARKER Female GC (or male, whatever) and put them back in the mailbox. On the underside of the lid of the mailbox, I put very explicit directions on what they do to fill out the GC, the form that goes with it (to be enclosed with payment) Who to make the check out to, the number for them to call the next business day if they would rather pay with credit card, and in BIG, BOLD LETTERS I state that GC'S WILL NOT be honored until they are paid for-no exceptions. I also state that I cannot guarantee GC's will be there at all times.I am currently looking for a lock box type of thing for my cash paying clients to feel secure with leaving payment as well.I have been doing this for a little over a year now, and my clients LOVE it! It is great for people that are stuck for last minute gifts, or if they can't get to the office before I close, or if I am in session and my door is locked.I am sure I didn't explain this very well, but if you would like me to send you the forms I have made (simple!) or the directions I have for the clients, I will be happy to.Sorry for my ramble! But I hope it helps somebody!