The phrase "always got one" is correct and usable in written English.
It can be used in informal contexts to indicate that someone consistently has something or is always prepared for a situation.
Example: "Whenever we go out, he always got one ready to share a joke."
Alternatives: "always has one" or "is always prepared with one".
Nick Griffin is a man who has always got one eye on a big, sloppy steak (and the other on whatever he's trying to look at) but surely could be persuaded to forge an alliance with animal rights activists over a cheekily sung version of "You're the One for Me, Fatty".
I've always got one eye on the possibility of things going wrong.
"You're trying to read, but you've always got one eye on the umbrella to make sure it's staying put".
When you're working, you're in the present, but you've always got one eye on where your next job might be coming from, and I don't think that will ever go away.
I rate it: like the polymath she is, Dijon's always got one eye focussed on the present, and one darting around the side.
He's probably always got one really good show on view somewhere in the world these days, and right now one of them is at Kasmin's.
On the Baghdad trip, the pool reporter for the newspapers, which always get one seat on Air Force One, was Mike Allen of The Washington Post.
Labour is reckoned to have a 60% chance of taking this seat back from the Tories, but in the midst of the general "Mwaah, mwaaah, mwaaah", one message seems to have got through: that the Scots are always getting one over on the English, and some climactic Caledonian heist is now a very real prospect.
He begs for an egg, too, and he always gets one.
"There are six slots to fill every season: Arthur Miller always gets one; Tennessee Williams gets another; I get a slot".
In composing, Tristan Perich opens up the sound-making possibilities of the raw machinery itself, always "getting one step closer to the flow of electricity through the microchip.
