With DD2, a colleague gave me a wedge changing mat and lots & lots of towelling covers for it. It was great, the shape meant that baby couldn't roll away as she got older, washable covers useful for the grotty changes.
The mat itself got a rip so I threw it out once she wasn't using it any more. I thought I'd kept all the covers. Am now expecting dc3 any day, so went out and bought a new wedge changing mat (having liked it last time) from John Lewis
I got home and realised I must have thrown out all the covers too 
. No problem, I thought, JL will sell covers. Despite having them online at the time I got the mat, they don't sell them any more and I asked in store - no plans to sell them (so why do they still sell the mats?? which are cold plastic without a cover on).
Mothercare sell something that looks right but is completely the wrong size (waaaaaay too small).
Anyone know where I can get covers for this kind of mat? The ones my colleague gave me were just plain towelling and v simple unlike either the JL or Mothercare ones. But she's moved away and I'm not in touch so can't ask where she got them from.