This is such a useful little thing for people with oily/combination skin. All you need is some wrapping tissue paper!
It is a very thin, translucent paper that most gifts are usually cushioned with or wrapped in. All you have to do is use a card (or use your own measurements) and cut out several rectangular pieces. To make several at the same time, simply fold the sheet over a couple of times and then cut neatly along the folds.
Store them in a zip lock bag or in a sturdy case and keep them in your purse to use for whenever your skin starts to get shiny. Easy, inexpensive and super effective!