You can buy Moshi Monster mash Up Cards at Asda, Morrisons, and other super markets and your local news agents or you can buy them on Ebay or Amazon! You can also buy the ca â¦ rds online at the Moshi Monsters online store. Mash Up trading cards are available in the UK at over 25,000 independent newsagents as well as The Entertainer, Toys R Us, Sainsbury's, Co-op, Martin McColls and One Stop.