Many of us prefer to use several smaller fleeces instead of one cage sized one. As well as less outlay, the bigger fleece liners can be hard to wash properly, also it's better if you have boars to do a half and half cage clean. When I first started using fleece I bought mainly from amazon as I had an address that was impossible to find and they offered click and collect. I also use bath mats but still have liners underneath.
The outlay is a fair amount but they pay for themselves and so much less faff than disposable.