Ok I may not be the fastest kid on the block but I just found these in my local Porn shop (Sorry I mean Staples):
Though it would be nice to have some with the hook pointing the other way as the hook size is perfect to hold a pen onto a Notebook.
Learn all about them here on this handy timeline.
The box of ten that I bought included a little pamphlet listing all the people that influenced it
You can get these awesome Quirky Bandits BND-1-CW1 Rubber Bands with Hooks (10 Pack Multi-Coloured) from Amazon too