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LefantHome via Amazon [amazon.com] has Lefant M330 Pro Robot Vacuum & Mop w/ dToF Smart Mapping & Obstacle Avoidance (Grey) on sale for $139.98 – $50 off when you apply promo code M505JZ2F at checkout = $89.98. Shipping is free.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.