The Knitting Network are offering five balls of Robin Mardi Gras Chunky for £5. The yarn is a blend of acrylic and nylon with 115 meters in eac h100g ball. There are also knitting patterns available as PDFs for free or printed 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.