Salt and Vinegar chips

Hi all,
I have a craving for salt and vinegar chips but no store Ive visited has it.

Ive tried Kaldi, Seiji Ishii, bunch of ethnic stores in Takadanobaba, Shin Okubo and Costco as well as several grocery stores.

Anyone know where they might exist? Getting them from friends in US for now.

Edit: Thanks everyone for so many responses!!!

So my partner and I made a treasure hunt date out of it and basically went around a bunch of the recommendations below. We couldn’t hit every location but we found it at:

Seijo Ishii (bigger stores only),
Bio C Bon under Futako Tamagawa station,
Juipter in Shinjuku,
York Mart,
Bio Ral under Shinjuku Marui,
National Azabu,
Central Square Life in Ebisu Garden,