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Amazon [amazon.com] has Allway 5-Gallon Paint Pouring Spout (GPS5)for $ 0.99. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).
Allway 5-Gallon Paint Pouring Spout (GPS5) $0.99 + Free Shipping w/ Prime or on $35+