The thing seems to be hard to temper with:
https://www.reddit.com/r/ethtrader/comments/69fgxp/security_question_could_a_ledger_nano_s_be/

What is the most reliable source to buy it (in moscow?)

Support of ledger-wallet.ru is totally unresponsive.

Thanks, found one here:

https://www.avito.ru/user/ee6099f1c2efba7405cf1ee341c9ce88/profile?id=1087361061&src=messenger

As this seems to be a reseller, how can I verify that these were not tampered with? Is there some Hash of the firmware that I can double-check?

I am in Tomsk and will be in Moscow soon. I urgently need a hardware wallet (ledger nano s or trezor) - where can I get one?