Help with first grading

Hi everyone! I have four Mega Greninja ex cards that I’d like to get graded. I noticed that PSA is currently only offering the €100+ service, which I’d rather avoid, so I’m thinking about going with BGS instead.

Could anyone recommend a reliable website or middleman to submit them through? I’m pretty sure that if I tried doing it on my own, I’d end up choosing someone unreliable. 😅 Thanks!