I've always used a Dayrunner ruler as my marker for my home airport for the last decade, at least. It pops in and out easily, but not as easily as the other jepp color-coded thingies I have. I never thought to tell others about it, I thought everyone knew. Whoops!

All the day runners I see have 6 holes (not like my Jepps, you're not the only one HSLD), except this