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Amazon [amazon.com] has 29.5" Wilson NBA Authentic Series Indoor/Outdoor Basketball (Size 7) for $ 21.35. Shipping is free with Prime or on orders of $ 35 or more.
Walmart [walmart.com] also has 29.5" Wilson NBA Authentic Series Indoor/Outdoor Basketball (Size 7) for $ 21.35. Store pickup is free where stock permits, otherwise shipping is free with Walmart+ (free 30-day trial [walmart.com]) or on orders of $ 35+.