Was looking for a cheap over-the-door hook that wasn't metal. Stumbled across the towel rail too, but is stainless steel.
Hook
https://www.amazon.com.au/Hookz-Over-Door-Hook-Clear/dp/B08B…
The Hookz Over Door Hook is designed to hang over doors in the kitchen, bathroom or laundry. Great for creating permanent or semi permanent hanging space. Easy to install and remove. Easy to install and perfect for any room of the home or office. This hook able to carry up to one kilo.
Towel rail SOLD OUT
https://www.amazon.com.au/Hookz-Over-Door-Drawer-Towel/dp/B0…
The Hookz Over Door/Drawer Towel Rail designed to hang over cupboard drawers or doors in the kitchen, bathroom or laundry. Great for creating permanent or semi permanent hanging space. Use for tea towels or hand towels. Easy to install and remove. 235mm length.
These are $9.98 on their website: https://www.hookz.com.au/product/over-door-drawer-towel-rail…
These tend to scuff your door frames especially if expanding during summer