Buy it on official store
https://shop.ledger.com/as I know they accepting bitcoin payment, don't worry about your credit card.
I also recommend the official website. And they accept card, paypal and bitcoin:
https://support.ledger.com/hc/en-us/articles/360006658493-Payment-methodsI really don't want to show my legal name and credit card information when buying bitcoin hardware storage online.
Well, if you want it to be sent to your home, you don't have much of a choice. Maybe Post Box, but I don't know how that works in Russia.
I'm thinking maybe I should make an older android phone as an offline storage, but I'm scared it can be vulnerable if it will not receive updates and such. Or maybe something like Raspberry pi?
An option is an USB stick with a live OS. (e.g Tails OS)
On the stick persistent storage you may have to install a newer version of Electrum, for example, and after that always make sure your internet cable is disconnected when you boot from the stick.
You can find tutorials here or on Electrum website how to work with cold storage. Basically you keep your seed on paper (and may have to enter it on every boot); on the normal PC you run a wallet in view-only mode, but you need it to create and broadcast transactions; the Live Os you keep only to sign transactions.
Imho it's cheaper and safer than hardware wallet, but (much) less convenient.
And as long as you have the seed on paper you can break the USB stick, you can erase it, reinstall, update, ... just I'd start with wiping it and reinstall before attempting an update (wipe doesn't need internet, while update probably needs it).
Edit: if you go for Electrum, before using it, please read the posts about making sure you have the legit version.