I just checked and they are available on amazon|
https://www.amazon.com/nuphy-Mechanical-Bluetooth%E3%80%812-4G-Connection%EF%BC%8CCompatible-Windows-White/dp/B0C69R5T56/ref=sr_1_3?crid=1XZFMAOC1ZLTE&keywords=nuphy%2Bhalo%2B75&qid=1690483086&sprefix=nuphy%2Bhalo%2B75%2Caps%2C95&sr=8-3&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840&th=1