I think you have it the other way around, there are A LOT of gigabit wired solutions avaliable and hardly any wireless. The only gigabit wireless solutions probably come in the form of a microwave dish right now
Gigabit networking has not net progressed to being mainstream at home. It is still used mainly for a corprate environment. That is why you don't see lots of gigabit switches in little home routers yet.
You would need to get a router and then plug it into a gigabit switch that the computers are using.
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