Amazon has these amazing black Hair Donuts for just $0.84 + free shipping. Keep in mind the package comes from Hong Kong so it could take a couple of weeks to get to you. They are super easy to use and make your buns look fantastic!
Here is a video tutorial on how to use these if you are not sure how to:
See how easy and quick! What an amazing hair accessory and at this price you might want to get a couple!
Disclaimer: Amazon prices can change quickly. This price was current at the time of this posting.