"priceless contribution" is a correct and usable phrase in written English.
It is typically used to describe an important or valuable contribution that cannot be measured in monetary terms. Example: Her dedication and hard work towards the project made a priceless contribution to its success.
Bellamy completed his priceless contribution by bolting on to a glanced header from Chris Sutton and shooting past Bullock from 12 yards.
There's a priceless contribution from Louis Armstrong, and the Cole Porter tunes put the movie on an unanswerable gold standard: High Society, Well, Did You Ever? and, of course, Who Wants To Be a Millionaire?
We would like to thank donor relatives for their priceless contribution and understanding.
Even though I'm currently working domestically, VFA continues to be a priceless contribution to my international development work, giving me the skills and experience I need to build Bloom from the ground up.
I recently made a priceless contribution to a circulating paint ping-pong with a koala I found with a simple Google image search.
On the 100th anniversary of her birth, we celebrate her life with gratitude for her priceless contributions to our lives.
On the 70th Anniversary of her birth, we celebrate with gratitude her generous loving spirit, her priceless contributions to her family, and her extraordinary life.
The monument calls Huggins "A splendid character who made priceless contributions to baseball".
The Italian… POSTSCRIPT about late poet Allen Ginsberg... Strange now to think of him, gone in a tsunami of obituaries (including the priceless scolding contribution of George… POSTSCRIPT on the late New Yorker writer Emily Hahn.
Joe Ledley probably touched the ball fewer times than in any other match he has played and yet his shuttling around the pitch, denying players space, made his contribution priceless.
That took Torres's tally for Euro 2008 to a modest two goals but this contribution was priceless.
