Make Headphones Wireless?

Was having a browse in a secondhand store today and stumbled upon a boxed pair of V Moda Crossfade M-80 headphones.

I’ve always been drawn to this brand but the price kept putting me off. These headphones had a price tag that could not be ignored!

However, I’ve been using bluetooth headphones on my commute and the cable doesn’t work for me. The cable is detachable, what are my options for making these wireless?

Cheaper the better please :stuck_out_tongue: