Tablet/phone holder https://www.amazon.com/dp/B079W8QKPF/ref=cm_sw_r_cp_api_glt_i_CGBVVFBRA4DB8DRX4PVW?_encoding=UTF8&psc=1

Video rear view mirror dashcam https://www.amazon.com/dp/B09DG8BL6R/ref=cm_sw_r_cp_api_glt_i_3TW3MXYB7H2MX1HQR3RV

Windshield shade for summer. Little awkward to fold and store but better than those umbrella ones.

https://www.amazon.com/dp/B07BQF76L6/ref=cm_sw_r_cp_api_glt_i_AZQZTZBTWFJC4G82WTM9?_encoding=UTF8&psc=1

Weathertec mats are a godsend

Ceramic tinting as dark as legally possible in your area. Prius has a lot of glass. Summer can be tough.

You can take it a step further and make some Diy window coverings with a roll of reflectix.