I was running down to my last 3 squares and was about to enter South Africa. Of course, gotta have 1 blank page to satisfy South African immigrations folks and that darned visa sticker. So, I stopped into the US Consulate in Dubai. I asked if I could have 2 sets of additional pages added and they said "sure, no problem". I just had to fill out 2 applications. It was finished in less than 5 minutes. It's a little like entering Fort Knox there, but was fast, easy, and friendly.