KeepKey is a Bitcoin hardware wallet with a screen. It costs $99 and can be delivered to nearly any country worldwide. Of all hardware wallets, it has the largest screen which gives it some extra functionality over other hardware wallets.
The Ledger Nano S is a new hardware wallet from Ledger. It has a screen meaning it can be set up in a secure way offline. It works with Ledger's Chrome extension and a number of other software wallets on desktop and Android.
Ledger Nano is a USB stick hardware wallet from Ledger. It does not have a screen which means you need to set it up on an offline computer or with Ledger Starter.
Opendime is a very unique hardware wallet. Unlike other hardware wallets, it has just one address and is meant to be passed around. Once the seal on the device is broken it means that the private key has been exposed and that it is no longer secure. Opendime is the first true physical Bitcoin.
Trezor is probably the most popular Bitcoin hardware wallet. It costs $109 and can be delivered to pretty much any country. It has a screen meaning it can be setup securely on any computer offline.