^Basically
Italy albums
3x platinum
Baby one more time - 300,000
2x platinum
Oops! I did it again - 200,000
Greatest hits my prerogative - 160,000
Platinum
Britney - 100,000
In the zone - 100,000
Gold
Blackout - 35,000/40,000 (depends when it got certification)
Circus - 35,000
Italy singles
4x Platinum
Scream & shout - 120,000
2x platinum
Baby one more time - 100,000
Platinum
Oops! I did it again - 50,000
Gold
You Drive me crazy - 25,000
Sometimes - 25,000
Lucky - 25,000
I'm a slave 4 u - 25,000
Overprotected - 25,000
Me against the music - 25,000
Toxic - 25,000
My prerogative - 25,000
Piece of me - 10,000
Womanizer - 10,000
Till the world ends - 15,000
Work bitch - 15,000
Spain albums
3x platinum
Baby one more time - 300,000
2x platinum
Oops! I did it again - 200,000
Platinum
Britney - 100,000
Gold
In the zone - 50,000
Greatest hits my prerogative - 50,000
Spain singles
Platinum
Oops! I did it again - 50,000
Me against the music - 50,000
Gold
Sometimes - 25,000
You Drive me crazy - 25,000
Lucky - 25,000
I'm a slave 4 u - 25,000
Toxic - 25,000
My prerogative - 25,000
Womanizer - 20,000
Scream & shout - 20,000
Didn't know many of these certifications for singles in Spain.