Silicone Case for Sony WF-1000XM3 Earbuds from 3 C Electronic Store on Lazada for S$5.43 with free shipping to Singapore.
Five colors are available, Black, White, Dark Blue, Red, and Cyan. I chose black. Regardless of colors, it comes with a black carabiner.
The last gadget that I bought in Japan is the Sony WF-1000XM3 Earbuds.
I bought it together with my GoPro accessories from Bic Camera at Aqua City Odaiba.