[Q] Q: Buying in US for international/EU use topic

Hello All

I'm finding all sorts of conflicting info out there. Would someone be able to succinctly answer which model Note 4 can I buy in the US that is:

• genuinely unlocked


• compatible with UK/EU 4G


• USA 4g would be best but being 3G-only in the USA is OK too

Bonus points for the least expensive, most reliable place to buy from in the US as well.
Extra bonus points for advice on the best/fastest way go get hands on a Gear VR bundle.

Thanks muchy!