These singles are both available for purchase in this CD collection:
The Singles Volume 1: The Federal Years 1956-1960
Think was JB’s third hit in 1960 on the R&B charts at number 7. A classic! Can you feel the funk bubbling up in the groove? On the ONE baby! You’ve got the Power is a duet with Bea Ford.
Wikipedia got a nice entry about Think.
You’ve Got the Power: