Places To Get Lean Ground Meat?

So I recently moved to Tokyo from the UK, and one of my biggest culture shocks has been fresh meat options.

I love going to the gym and for my goals a high protein diet is pretty necessary. I loved having lean mince and ground meat options back home as I could shape and cook it to my liking; however, I’ve noticed finding lean ground meat (especially % marked lean meat) has been a real struggle. Obviously chicken mince is pretty easy to find but I’m getting bored of it now lol

I was wondering if anyone knew of anywhere to find stuff like 95% lean mince beef or pork consistently?

There’s a maretsu petit near me in Nakano that sometimes has 95% lean pork mince but it’s only in tiny 80 – 130g packets and I can only ever seem to get one which only good for one meal.