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Monteka US via Amazon [amazon.com] has 100W Electric Lunch Box Food Heater w/ 1.8L Stainless Steel Container (12V/24V/110V/220V) on sale for $29.99 – 50% off when you apply promo code P4UMFKXP at checkout = $14.99. Shipping is free w/ Prime or on orders $35+.

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.