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Sleep Number’s cheapest smart mattress drops to $539 for Memorial Day — with built in sleep tracking and adjustable firmness

Sleep Number is known for manufacturing the most affordable smart beds on the market, and the c1 smart bed is the most budget-friendly model in its catalog. With 10% off all sizes, you can now save $99.90 on a queen c1 Smart Bed at Sleep Number, bringing the cost to $899.10 from $999. Sleep Number is the brand behind the…