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Amazon [amazon.com] has Marina Large Standing Aquarium Thermometer on sale for $ 2.99. Shipping is free w/ Amazon Prime or on $ 25+.

Product Description from Store[LIST][*]Aquarium Accessory: With water temperature a critical factor for the well-being of fish, it’s important to have a good thermometer. Marina Standing Thermometer is designed to sink to the bottom of the aquarium and remain in a vertical position.