I use drynites mats. Its for kids who wet beds, its very cheap in Sainsburys and works magic.
http://www.drynites.co.uk/Products/bed_mats.aspx
it covers my ferplast 140 and i use newpaper under it and then fleece on top.
i do wash fleece more oftern than i would change normal bedding.
i also noticed that putting a cats litter tray for hay helps. they pee in there, so i just change that every day.
but with fleece you do have to do several poop picks a day.
just one of those things, but i just couldnt afford expensive bedding
ps. i have a candle on a table by the pigs, helps with the smell.