All seem to be out of stock !!!
Trezor are in stock. But if you want my advice, I would say buying one can wait. I bought one that arrived last week and it made me feel like it was a wasted purchase. I store my seeds and private keys well enough for me not to need a hardware wallet.
My overpriced Trezor is just one more seed to back up and store.
You can always get an USB stick and just put your keys on there, be it a paper wallet image, or a wallet.dat bitcoin core wallet, or whatever else, just be sure to encrypt the thing.
I guess the special appeal with hardware wallets is that they isolate the device from the OS so even if the OS is infected, nothing happens.
Yeah, this is what I do. Cut everything in a USB and plug it in only if you are using your wallet. Make sure nothing is left in your computer after using it.
If you are feeling very paranoid use encryption software like Veracrypt on your USB.
If you are going to spend money on a hardware wallet, you better learn how to properly use it and the prons and cons, otherwise just go with the USB approach + Veracrypt or whatever, so people can't steal your coins.
I've heard some people using the Veracrypt approach to put their screenshot of a QR code of the private key of the paperwallet. I think depending on this is not a good idea. I've noticed that images tend to corrupt rather easily overtime for some reason.
I think putting an encrypted wallet.dat file is a way more robust approach than using an screenshot.
I would probably use all types of ways to store private keys and just put them all together in a Veracrypt container.