Based on our record, Gatebox seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I've seen some used ones on Ebay. You might try contacting the makers at their 'Contact Us' page on gatebox.ai. I don't understand Japanese so I can't navigate the Japanese version of their site, but supposedly that's where you can normally buy it. Source: almost 3 years ago
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