I was at Genuardi's supermarket today and saw a bunch of Poof sports ball on one of those stacks that sit in the middle of aisles. They are sold in boxes of two, with one football and one junior basketball (our 7" Poof Ball
). They were $12.99/box, but with my Genuardi's card it was down to only about $3.99/box. So I did some switching of box contents to get 3 boxes of two balls and one box of a ball and a football. So 7 balls total for about $16.
I checked out another local Genuardi's and they didn't even sell them, so I can't guarantee that a Genuardi's store near you will have them, but I would recommend checking it out if you are having issues finding these balls.