The phrase "a unique offer" is correct and usable in written English.
It can be used to describe a special or one-of-a-kind proposal or deal that stands out from others.
Example: "Our company is excited to present a unique offer that combines exceptional value with exclusive benefits for our customers."
Alternatives: "an exclusive deal" or "a one-of-a-kind proposal".
"The quality of the technology and imagery we have developed over the past 12 months is outstanding and really pushes the boundaries of online shopping expectations," said Ball. "We are starting with fashion and see a future for galleries, furniture stores and specialist shops – anything with a unique offer and store experience to share".
Warwick's David VandeLinde (a real old-fashioned professor) predicts that other UK universities will follow the move which, he told the Times Higher, will "give us instantly internationally recognisable titles and provides us with a unique offer to our academic teaching staff in which all can share in the title of professor".
We went through the whole process of setting up a unique Web address, a unique phone number and a unique offer to subscribe for Passions.
Google just started promoting the service recently to small businesses and already has about 42,000 offers (assuming each result is a unique offer).
Second, identity a "Unique Brand Offer"(i.e., UBO), rooted in a "product" or "brand truth," that addresses the insight.
I believe law enforcement has a unique perspective to offer and one which should be heard".
The channel shape is a unique design parameter offered by a structured catalyst/reactor.
TCMGeneDIT is a unique database that offers diverse association information on TCMs.
Through a unique combination of offered services and products, they will quickly gain market share.
Roswell offers a unique curriculum with many electives not offered anywhere else in the county.
The ships' cargo alone offered a unique guide to medieval life around the Mediterranean Sea.
