Where to buy a replacement band in US?

I'd like to buy model 371446 for my friend. He asks if I can buy a replacement band for him, too. I'm living in the US and the online seller doesn't sell replacement band. If I need exactly the same strap as the original one, where can I find it? Thanks.

www.iwc.com/en/collection/portugieser/IW3714/

Bracelet/Strap blue alligator leather strap

Hi, feel free to drop me an email and I would be happy to share some options with you.

notenoughwatches at gmail dot com