I would recommend Fitch you can buy it from Amazon or direct from their website (which works out cheaper) - I switched from carefresh to Fitch and it is such a great substrate, virtually no dust, soft and inexpensive however it does come in a large bags so a little more difficult to store (10kg, 15kg or 20kg bags). The 10kg bag lasted 4 to 6 month when I had a 80 x 50cm cage.
https://www.amazon.co.uk/Fitch-Paper...keywords=Fitch
https://www.fitchrecycling.co.uk/fit...-delivery.html