This Ireland pet store sells Carefresh. It can work out expensive if you need a lot, but you can also use a mix of two different beddings if you wanted to use some as well. Either mixed together (which can help hold any tunnels they dig in shape) or a separate area with a different bedding, for texture variety to keep things interesting.
https://www.petstop.ie/small-pet-pro...0&isAjax=1&p=1
They don't sell Kaytee Clean and Cozy (which has only recently become fairly easily available in the Uk anyway).