Warning: extremely frugal tip ahead.
When you buy facial tissue, look for a pretty box that matches your office or kitchen colors. When the box is empty, cut off the top and use the bottom to store things. I have a facial tissue box with red apples and roses on a green background which holds my stash of pens, pencils and markers on the back of the office desk.
Use the cut off top and cut bookmarks from it. Bookmarks are usually 5 to 6 inches long so you can get two from one box top.