So I could buy 2 set them up as clones and put one in a bank safety deposit box?
then if my in house breaks or is stolen I could go to my safety deposit box and access the wallet?
if true to both questions and you have a decent amount of coins I would consider buying it.
and if I was buying 2.
I may as well buy 3.
since 2 = 238 usd and 3 = 299 usd
You can't make clones, each device has a separate private key and even if you could 'clone' it, it would be pointless in purchasing more than one device.
Just make sure you never misplace your Trezor and your recovery card at the same time, then you would be truly screwed. If someone steals your Trezor they can't access your funds because you have a PIN setup, each time you enter the PIN incorrectly you get locked out longer and longer at each failed attempt. You would have plenty of time to get your recovery card from your safe deposit box and recover your funds before the thieve could ever access them.
Your point about not being able to clone a trezor is only partially accurate. A trezor is basically a hardware HD wallet. During its initialization process, you're provided with the 24 word passphrase which is the human readable representation of the seed value for the wallet.
You can definitely recover another Trezor with the same backed up passphrase and both units will have the same seed and key set. Basically the restored backup would be identical to the original.
Currently I have a backup unit, but I've kept it in the box and have not used it to recover my main unit's seed value. That's because I figured that if I never use the backup, I might as well leave it in the box unopened. Maybe in the future they'll come out with a Trezor 2 and I can sell or give away my unopened backup.
As an alternative to having a backup Trezor, you could restore the passphrase to a software wallet. I think that Electrum V2 supports the same standard, but I'm not sure.
Of course you'd only want to restore to a software wallet if it was an emergency, like your Trezor was stolen and you want to move the funds out fast to another wallet under your control.