I need a GOOD affordable sunscreen for hyperpigmentation

Hi. I’ve been on tret 0.1 for about a month now (previously on 0.05) and my main target is hyperpigmentation so I need a holy grail strong et protective sunscreen. I’m black so white cast is an absolute no for me and I also have super oily skin.

I’m currently using the svr sun secure extreme ultra-matt gel but them people charge a lot for it where I’m from like please I’m just a student. 😫