If it's just a Bluetooth deck, fine. But these android auto, carplay units are able to have full access to your phone, contacts list, GPS history, banking details, whatever else you have stored on your phone.

If you want cheap, get a basic Bluetooth deck, and a mounting bracket to hold your phone in your line of sight for navigation.

https://www.crutchfield.com/p_158DSXA41B/Sony-DSX-A415BT.html

https://www.amazon.com/Windshield-Upgraded-Dashboard-Washable-Compatible/dp/B085CD27GQ/