Easy – you get it free just by getting to part 2 of the Stanky Fish quest as part of the update to promote this Sunday’s new episode of the Simpsons. (To get it, though, Homer needs to be free as Lisa comes out of the Kwik-E-Mart). And even better, as it’s really a decoration, you get it right away – and it’s all yours even if you don’t buy the Swanky Fish restaurant.
But, remember, it’s available for a limited time only. In the past, that’s meant only 3 days or so. Once the promotion is over, though, it’s yours to keep – and new players will be wondering how you got it.