Title says it all, really! I need a spare, to keep at my parents' house. DD1 is getting too large for the various bodged solutions we've used so far. But a new one is £££££. They come up on ebay from time to time I know, but there's nothing on there right now and really we need something in the next couple of months.
I've tried googling second hand equipment, but there's not much out there. [puzzled]