Wool-Yarn Headband for $10~ [various colors]

There are four different colors of the Geekria wool-yarn headband for headphones going for around $10 (prices varies slightly by color), sold by Geekria with the order fulfilled by Amazon. This is a universal-ish headband for mid-size headphones. It says that it just barely fits the AKG Q701, so check size and customer reviews to make sure if its on yours.

Caution: the main picture for the grey color scheme shows a headphone with the gray headband on a headphone stand. Only the headband is included. Not the headphone stand! Check the other gallery pictures over there to get more views of the headband.