Just been to Home Bargains, and found Air Wick Lumin'air Trail Pack 99p.Retail price is £6.00 only in lavender and camomile though
Comes with a 30 day fragrance that is suitable for all air wick products!!, so even if you just buy it for your air wick plug ins your saving three quid !!
This is my first post although use this site regularly but thought this was a good bargain !! hope im not double posting or this is in the right place