The Knitting Network are will donate £5 to charity for every Crisis Charity Christmas Knit Kit sold. The kit includes two balls of stylecraft Life Changes DK and and a knitting pattern for Double Loop Snood and Wrist Warmers and costs £7.99.
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.