I was looking for a cheap keyboard and mouse option without having to pay over $100 and found these items. I'll put the link below. It's great for using Dex and almost works like a portable laptop. Keyboard and mouse were $20 each and the case was $13. The connect instantly and haven't had an issue yet. For me I didn't want my tablet connected to a keyboard case because I mostly use it separate.
Logitech Bluetooth Mouse - https://forums.androidcentral.com/e...oth-Wireless-Mouse%2F958643182&token=FWCUBYeh
Bluetooth Keyboard -
https://www.amazon.com/dp/B07PFCRWG...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534
Case -
https://www.amazon.com/dp/B08DCW4JG...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534
Screen Protector -
https://www.amazon.com/dp/B08BL1LD1...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534
Logitech Bluetooth Mouse - https://forums.androidcentral.com/e...oth-Wireless-Mouse%2F958643182&token=FWCUBYeh
Bluetooth Keyboard -
https://www.amazon.com/dp/B07PFCRWG...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534
Case -
https://www.amazon.com/dp/B08DCW4JG...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534
Screen Protector -
https://www.amazon.com/dp/B08BL1LD1...ag=hawk-future-20&ascsubtag=UUacUvbUpU6882534