Walmart offers the Spalding NBA Super Tack Basketball, model no. 64 400E, in official size (29.5") for $13.46. Choose Site-to-Store pickup to dodge $4.97 shipping fee. That's the $6 off list and the lowest total price we could find, although we saw it for a buck less this time last year. It meets the official size and weight specifications set by the National Basketball Association.