Plastic straws will be banned from April 2020 in England – so what are the cheapest alternatives?

The Government has just announced that the sale and distribution of disposable plastic straws will be effectively banned in England from next April, in a bid to reduce the amount of plastic we throw away. Yet many of us like (or even need) to use some form of straw – whether due to disability or simply wanting to protect our teeth. So what are the cheapest reusable or eco-friendly alternatives?