Spalding NBA Varsity Outdoor Rubber 29.5 Men’s Basketball for $6.29. Shipping is free on orders over $25. If needed, use this Filler Tool to qualify for free shipping. (You can also just get 4 for $25.16 to get free shipping.) Here is a screenshot for your reference. This is the official 29.5 size 7 men’s basketball. Most places have it for about $20.