The Rash* (R.Shamshon -Shanz) writes that in the times of the Amoraim they still had Aifer Parah Adumah.
The Midrash Lekach Tov** " Reb Yochanan said from the day of the Churban Bais Hamikdash there was no more Aifer Parah Adumah"
The Chida*** writes, "The Amoraim had Aifer Parah Aduma and I am sure the Arizal had Taharas Aifer Parah Aduma done to him by Eliyahu Hanavi. From then on he had Ruach Hakodesh"
* Challah 4:8.
** Beginning P.Tazria
*** Midbar Kadeimos 1:26