The Knitting Network are offering 3 balls of Sirdar Bohemia for £12. The super chunky yarn is a single ply wool/acrylic blend with 50m per 150g ball. There are also knitting patterns available for £1 each.
You can find all their sale yarns here.
This page includes affiliate links, if you follow them to shop it wont cost you any more but I may receive a small commission which goes towards the running costs of Pollyknitter.