few and far between
not happening or existing very often:
Flats which are both comfortable and reasonably priced are few and far between.
(few and) far between ごくまれに.
And if it’s true that this cliché has now been mostly supplanted by another — the husband-and-wife team, working side by side at the computer screen — how does this help a woman striving to make it on her own? Who are her role models? In New York Lindy Roy, Annabelle Selldorf and Winka Dubbeldam are all important architects who are just starting to leave a mark on the city — without, I should add, husbands to balance their books and stroke their egos. But such examples are few and far between — and even they are still relatively unknown.