So, according to @almircarone (which is very trusted, he was the one who gave us the HTL radio updates when they weren't included on mediabase) these are the sales for Selena's singles:
Tell Me Something I Don't Know - 800k
Magic - 500k
Falling Down - 500k
Naturally - 1.9m
Round & Round - 700k
A Year Without Rain - 850k
Who Says - 1.9m
Bang Bang Bang - 100k
Love You Like a Love Song - 2.2m
Hit the Lights - 300k
With the total being around 9,750,000 singles sold.
*Note: These are estimated by him. He used UKMix, ChartNews and YahooMusic as a source.
OMG What? i know i just know that he is not good for her
Yup during his special he was doing a show at the Appollo and at some point they showed someone sitting in a chair for two seconds and the face was blurred. And at the end again when Justin's about to get in a car we see someone with the face blurred out.
Hopefully they will give her the right promo i don't want them to do the same mistakes they did this time first Music video after the radio adds , Radio adds for Hot AC also,a real collab with international artists
I don't want MON as a single. It should stay as an album gem. BBB should've been released
But its flawless And the video would be amazing, she could be stranded in like some sketchy motel room with somebody drugging her... What kinda flawless storyline would it have been
Hopefully they will give her the right promo i don't want them to do the same mistakes they did this time first Music video after the radio adds , Radio adds for Hot AC also,a real collab with international artists
They also need to stop picking flop lead singles..I mean Falling Down then Round and Round.
i know i just know that he is not good for her 
at tell me something I don't know selling more than round & round and falling down
And the video would be amazing, she could be stranded in like some sketchy motel room with somebody drugging her... What kinda flawless storyline would it have been