I've found this mug available on many sites, although the least expensive I've discovered has been a favorite fun stuff resource of mine, McPhee.com.
"Our team of scientists has just recently discovered a new species of cephalopod, the mug-dwelling octopus. This tentacled, porcelain mollusk prefers the cozy confines of a simple coffee mug to the vast depths of the ocean. Each 3-1/4" tall, porcelain mug features one of these odd little octopuses on the bottom. Great for coffee, tea or ramen noodles! Dishwasher and microwave safe."
The octopus mug comes in a neato box too!
I highly recommend this octopus mug as a gift - to yourself or a fellow ceph-lover!