I rarely see them on PF. You might try a google images search for "phantom poodles for sale". Since you already know what health tested means for poodle (like here), you can visit those sites and see the extent of any DNA testing. Embark also does these tests.
However I would first try the United Poodle Association and use their Member list. Many of them show their phantom and other multi-colored poodles in their conformation shows.