Popular GACHA-GACHAs seem to run out of stock quickly.
Toys, including GACHA-GACHA, are mostly made overseas and brought to Japan. You might see a capsule toy that says, “MADE IN CHINA”.
This is why they cannot be resold immediately when they become very popular and sell out.
So, buy it once you find your favorite, or it might be gone! It’s like a once-in-a-lifetime encounter, as they say ‘Ichigo ichie’ in Japan.