Hi,
Renedra, who make the plastic ruins frames for use with Frostgrave and other games, are having a 25% off sale for their own products (only) on their website today and tomorrow. That includes Ruins frames A-D at the moment with free UK shipping for orders over £20.
By my maths that means you can get 6 assorted ruins frames for £3.75 each all in.
Should have put a link in really:
http://www.renedra.co.uk/productlist.php?category=4&secondary=32