Aldi are doing them at the moment, dunno how much.
Painted woodchip comes off fine if it is emulsion, when it has been painted with gloss and made waterproof woodchip - that is a challenge.
What works really well is wallpaper paste - mix to a weak level, just paint it on the paper, it holds the water against the paper, leave it for half an hour and paper comes off as easy as soft putty - usually. Some people add a bit of washing up liquid as well, I have never tried that. If you can't find any cheap paste, use cheap flour for the above, anything that thickens the water so it doesn't run off, but don't use flour for pasting paper on, it gets mouldy.