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The phrase "are so expensive" is correct and usable in written English.
It can be used when discussing the high cost of items or services, often to express surprise or discontent about their price.
Example: "These concert tickets are so expensive that I might have to reconsider attending."
Alternatives: "cost so much" or "are quite pricey".
Dictionary
Exact(56)
"They are so expensive.
"Sitters are so expensive".
That's why these benefits are so expensive.
But nowadays books are so expensive.
Indeed, this is another reason the programmes are so expensive.
Movies are so expensive that they play it safe.
Those things are so expensive here that it's laughable.
"Customers are always asking why things are so expensive," Ms. Rubi said.
But there's still fear because shows are so expensive to stage.
It is also because the drugs are so expensive — about $200,000 a year.
So are the high rents the reason Manhattan cuts are so expensive?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com