Australian Sales

Albums

1. Gold - 1,190,000 (1992)

2. Best Of (1975) - 1,100,000

3. Arrival (1976) - 925,000

4. ABBA (1975) - 610,000

5 18 Hits (2005) - 280,000

6. Ring Ring (1973) - 142,000 *

7. The Definitive Collection (2001) - 140,000

8. Waterloo (1974) - 112,000 *

9. The Album (1977) - 100,000 (guestimate)

10. Complete Gold - 70,000

 Best Selling Albums of All Time in Australia - ABBA has four entries. Other sources here

* From Billboard Ad, 1977. Check out this list too.

Singles

1. Fernando gold x24 400,000 *

2. Dancing Queen goldx20 322,000 *

3. Money Money Money goldx13 244,000 *

4. I Do I Do I Do - gold x10

5. Mamma Mia - goldx9

6. SOS goldx5

See here for source. 

* From Billboard Ad 1977