Apple runs a new AirPods ad in Korea, which shows the fun side of a popular wireless headphone that I didn't really focus on before. Possibility to customize AirPods by adding fun and colorful cases. Various examples of BTS's BT21 line characters and Kakao Friends mascots are on display.
I'm not sure if Apple is using ads to showcase multiple cases offered by third parties in Asia, or if this is a premise to sell (or self-design) AirPods cases in its own stores, but it's a funny look.
The AirPods case is not new. There are a variety of options, including the obvious best case, turning this case into a pidget spinner. Apple does not sell directly. As my colleague Dami Lee points out, the AirPods case is even more popular in countries like Korea. Creative knit design, keychain hole for accessories, etc.
You do not completely exclude US AirPods owners. Many of these cases are available on Amazon or eBay, but you may need to pay a little more shipping.