In reply to haworthjim:
Yes, I second the reccomendation of fontaineblhostel. I have just got back from spending 4 nights there camping. Not the cheapest camping (€15 per night) but fanatstic facitlities (kitchen, showers, drying area all very clean and warm) and friendly owner, he loaned me a sleeping mat.
You can pay less, but still over €10, at other sites and have rubbish facilities. I'll be going back there next time.