It varies, mostly depending on land acquisitions through eminent domain, because in the United States, the constitution requires just compensation for all land taken through eminent domain. Things like that can put the price tag in the million dollar range.
Multi-lane rotaries would most likely cost more.
For you non New Englanders, a rotary is New England speak for a traffic circle, or roundabout.
Clarify
In 1858 it had not been invented, so the cost was zero.
Ford Escorts use an inline 4 cylinder overhead cam engine, not a rotary engine.
Unfortunately, the answer to that question is difficult to come by without knowing the location and use of the rotary couplings. The answer could be anywhere from $200-$2000. Please specify use for rotary couplings.
It cost about $550 million to build.
it cost 1p to build this building
It cost about 9,000 pounds to build a Spitfire.
It cost about 300 million dollars to build your welcome
About 10.5 is the cost to build
Mechanics in NZ who work on Rotaries are currently on holiday.
It cost 1,000,000 dollars to build the Rosenberg Castle.
What does i:-) t cost to build Costco