The Knitting Network will have new offers every day during their Black Friday Week. The offers include a Mega Mystery Bundle containing an assortment of 22 items for £19.99. The bundle may include a mix of balls of yarn and patterns worth over £60 RRP.
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.