Sadly no acapella or instrumental of Super Psycho Love, only thing I could find was an instrumental of a different version that just doesn't catch as much. But I say that a mashup between that and Circus would be so dam good-

Circus (vocals) by Britney Spears:

https://youtu.be/gSjVldfmlz4

Super Psycho Love by Simon Curtis:

https://youtu.be/MS_NvcpdSNo