The phrase "alone cost about" is not correct in English.
Did you mean "alone costs about"? If this is the case, you can use it when discussing the cost of something by itself, without considering additional expenses or items.
Example: "The new software alone costs about $200, not including installation fees."
Alternatives: "by itself costs approximately" or "solely costs around".
How could you build such a computer, they asked, when screens alone cost about $100?
Books alone cost about $10 for junior school pupils and $30 xo $50 for high school pupils.
And while considerably more expensive than asphalt shingles -- the tiles alone cost about $235 a square, not including installation -- they are considerably less expensive than slate, which costs about $450 a square, not including installation.
How could you build such a computer, they asked, when screens alone cost about $100? Mary Lou Jepsen, the chief technologist for the project, likes to refer to the insight that transformed the machine from utopian dream to working prototype as "a really wacky idea".
The teenager was unsure if she would be able to pursue her dream, however, as she did not have funding, and tuition fees alone cost about £13,000 a year.
The drum dance alone cost (about US$105,000 in 1948), equal to the complete budget for a typical Indian film of the time.
By comparison, airfare alone costs about $1,000.
The tablet alone costs about £239 for the 3G version.
The Roadster's power train alone costs about fifteen thousand dollars to manufacture, five times what it would cost for a standard car.
Although Nalls wouldn't say how much he paid for the plane, he said fuel alone costs about $75 for every minute in the air.
As a general guide, a 2011 report by the Congressional Research Service estimated that scoring of multiple-choice questions alone costs about 15 percent of a state's testing program (that would be about $6 million in New York).
