Tom Nook and Isabelle are now available as winter versions in Animal Crossing: Build-A-Bear Workshop.

They still haven't sold out!
The first two plushies in the Animal Crossing: New Horizons series, Tom Nook and Isabelle were published earlier this year by Build-A-Bear Workshop.
The animals were sold in "Summer Gift Bundles," which included a single stuffed animal as well as a summer-themed outfit for them to wear. Those packages sold out fast, but they've since been restocked and are still available as of this writing.
Build-A-Bear has now added to its New Horizons line by releasing new Tom Nook and Isabelle packages of winter-themed clothes.
The price of each "Winter Gift Bundle" is $51. The stuffed animal of your choosing, as well as a winter-themed outfit for the plushie, are included in these bundles. Each kit also comes with a sound module that will be installed within the animal to allow it to make noise.
For each animal, there are two Winter Gift Bundles: one includes a sound module that plays the character's voice, and the other includes a sound module that plays the Animal Crossing: New Horizons Opening Theme song.
All four of these Build-A-Bear Winter Gift Bundles are still available to buy on the company's website as of this writing, but we wouldn't be shocked if they sold out quickly.