How do you get the yellow digger in Club Penguin?

(Member way): Buy it in the catalog.

(Non-member and member way): it is sometimes a free item!

(2008 way, and 2008 only!): You had to participate in CPIP (Club Penguin Improvement Project). It gave you lots of money, too! The 2008 color was red. If you see a penguin wearing it, they're a beta!