The Knitting Network have reduced the price of Scheepjes Cocktail to £1.25 per 50g ball. The yarn is a machine washable 5ply weight cotton and acrylic yarn with 125 meters in each ball.
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.