Cheap DIY Headphones Holder

Banana holder from Daiso $2 SGD
Not all Daisos have this, found mine in ION Orchard Daiso.

Airtight sealing tape (doors and drawers) $2 SGD from Daiso
Get the waterproof version as it is thicker (0.8cm) and would provide more protection for your headphones.

Total cost: $4

Simply cut off a small bit of it.

Then stick it along the banana holder rod as centered as you can. The adhesive is quite good so it doesn't shift position. Make sure you stick it right down onto the rod or it won't stick completely.

And there you go!

You can cut much smaller pieces depending on your headphone size.