Hiya
We stayed at http://www.ukcampsite.co.uk/sites/reviews.asp?revid=4847
this weekend just gone. Its not 'quite' mid- Wales (sort of the bottom of North Wales) but it came to about £11 a night for me, my other half and 3 kids (admittedly two of my children are below the age where they have to pay).
Very nice quite and peaceful site. I have added a review but it won't be showing up for a bit I guess.
MM
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.