"pick up somewhere" is correct and can be used in written English.
You can use this expression when you want to start talking or thinking about a topic after having stopped for a while. Example: We had to stop talking about the budget last week, so let's pick up somewhere.
People working in those jobs pick up somewhere around 40,000 pounds a day.
And for his last show at the Lisson, Opie designed the catalogue to look like a freebie product brochure you pick up somewhere like B&Q.
Each new record has taken a bit of getting used to, though, as they always seem to pick up somewhere to one side from the place where the previous one left you.
And it took me two days of searching before I could find a souvenir for my son that wasn't something I could pick up somewhere along my commute to work.
The DS version, Chinatown Wars, caused predictable moral outrage with a drug-dealing mini-game, but usually drugs are the things that you're supposed to pick up somewhere after murdering some people and then deliver to somewhere else.
expect Democrats to pick up somewhere between 12 and 20 seats in the House and take control of the Senate, either because they actually win a majority in that chamber or because a Vice President Tim Kaine would get to break ties.
In mid-May, each network usually "picks up" somewhere between 5 and 10 pilots to become series for the fall.
In the litigation underway, the state confirmed the solution is now 'mixed' before it is picked up somewhere in Texas and driven in an air-conditioned car to the prison.
I tend to buy books which were the basis for movies I like and I was sure I had an old paperback copy I'd picked up somewhere for a quarter or fifty cents.
A few months ago, I went back to the audiobook site to use a free credit I'd picked up somewhere, and when I logged in I realized in horror that I'd been subscribing to it all along and forgotten about it.
There in the dining room are the Louis XV chairs and settee, the Aubusson carpet and the slightly kitschy hand-carved wooden candelabras, all set off by the stone urn covered in moss — which I surely picked up somewhere in my travels — and the ersatz Giacometti sculpture.
