'boundless range' is correct and usable in written English.
You can use it to describe a vast amount of variety or choice. For example, "The grocery store had a boundless range of different varieties of cereal."
Napster, by linking music lovers and letting them share their collections, lets them select from a boundless range of music, one song at a time.
The film-maker ramps up the action a thousandfold in A Christmas Carol, swooping us across the rooftops of Victorian London, out to the countryside and even up to the stars as he revels in the boundless range of virtual cameras.
The center's stage is typically immense, its claimed territory boundless, its age range universal.
What is more, it could be endless, boundless, this image.
Even when it is not executed perfectly, theater can stir a range of feelings, from boundless elation to existential despair.
Now there are boundless acres of vines, of an astonishing range of varietals.
Depending on how emotionally stable you are, the content of that projection can range from titillating speculation to boundless paranoia that is largely reflective of one's own insecurities.
We married our passion for design with our love for shopping this way — we love the flash-sale model, and the range of items we can sell is boundless.
In contrast, the disintegration of an individual's marriage arouses concern and anxiety in other family members, especially the divorced individual's parents.4 In Chinese cultural situations, the range of parents' responsibilities for their children appears to be boundless, from giving birth and bringing them up to taking care of grandchildren.
Beside her huge voice and its amazing range in both the sung and the spoken word, Maya had a boundless humour.
We don't share in the "boundless plains", we have not enjoyed the "wealth for toil", the sweeping plains and rugged mountains ranges of a sunburnt country were too often places of death for us on the Australian frontier.
