you can get them for 30 quid if you buy from china
most will need an adapter surround
Think you need to ask yourself, at £30 will it be any good? Can you buy a decent £30 phone? There is a reason Alpine and such command £350-£700......
I looked at youtube reviews , I wanted a back up camera, it does that , sound quality may not be great , dunno , not tried it , will lose the steering wheel controls too , but having driven a vauxhall carlton for 18 years ,that never had steering wheel audio controls , i'm not going to miss that feature
the alternative being , i also have one of these knocking about
https://www.ebay.co.uk/itm/7-LCD-Monitor-Mirror-Car-Rear-View-Kit-Wireless-18-IR-Car-Reversing-Camera-UK/312063504818?hash=item48a86f31b2:g:xUgAAOxyFIFR~3~hso i could keep the original radio gram vauxhall fitted
great design , can't eject the 4 CD cartridge whilst in PARK
If i went that route, i'd probably mount it to the screen sun visor ,rather than on ,or in place of ,the rv mirror