I would try John Lewis if it is wooden beds that your are after. They have a big range and I thought very good value for money. Can buy with or without storage so should have something that suits. 

Has anyone spotted / purchased a good quality single bed for their tween / teenager that doesn’t cost silly money and is attractive in a simple way?

Looking for something simple and well-made, probably wood and ideally with a storage drawer of some kind.

Options out there seem depressing - poor quality or too expensive for what they are.

Thanks for any shopping tips! I have a 13 year old boy and a 10 year old girl ready to ditch their respective bunk beds.