SafePal is cheap but I will recommend
open source hardware wallets instead.
SafePal is a close source wallet
SafePal software is close source
The hardware wallet can not be connected to other software wallet like Electrum which is open source
The software wallet only supporting mobile phones, not supporting computers
Not supporting multisig
No coin control for privacy
I think this below link is also legit, which is how you can access where the hardware are sold
https://docs.safepal.io/safepal-hardware-wallet/orders/buy-a-safepal-wallet1) Is
https://safepal.com the original or official website for this hardware wallet? That's what I found online.
On the link above where you can buy SafePal, the first site is their official site which is
https://www.safepal.com/. This is the SafePal official site.
2) is it safe to buy it on Amazon store if I want?
Check the above link, if you are close to a reseller in a way you can buy it directly and not ordering it online, it would be better. Just for privacy reason.
It says that it keeps coins safe 100% offline < that's where I'm lost, to store coins on the wallet could work just like paper wallet, accepted, but what about if I want to send the coin out to an exchange for example? Will it still work offline?
SafePal has a mobile software for making unsigned transaction, sending it to SafePal hardware wallet for signing. After it is signed, it would be sent back to the software wallet to be broadcasted. Just like hosseinimr93 commented, the transaction is only broadcasted online (on the SafePal software on a mobile phone), but signed offline on the hardware wallet.