For the last craft fair we did, my boyfriend made a spinner rack to display my bookmarks on. It's awesome and does the trick. The problem was that when people spun it too fast, the bookmarks would fly off because there were simply sitting on two hooks. See above.
Yesterday we went out in search of a solution to this problem and today Matt spent a good amount of time affixing plastic to the rack so that the bookmarks will stay in place when it's spun. It looks great and I'm so glad that the problem is fixed. What we ended up using was plastic book covers cut into strips and stapled to the box.