NGRAVE sells through its own Shopify store, and the deals are automatic rather than code-based.
The clearest one is the Ultimate Combo Pack, marked "Exclusive Deal" in the shop: ZERO + GRAPHENE plus accessories at 568.00 EUR against a regular price of 597.00 EUR - 29 EUR lower, and the only product in the store currently carrying a strikethrough price. Individual ZERO units (398 EUR) and the ZERO+GRAPHENE combo (498 EUR) show no discount.
Shipping is the second lever: the shop banner states "Free Shipping on COMBO PACK and ZERO orders", and the main ngrave.io site adds "Next-Day Free Shipping. We ship the very next day, free for orders above $300."
How to redeem
Nothing to enter - the combo price and free shipping apply at checkout automatically.
What we watch for
The store is re-checked daily. NGRAVE has run timed campaigns before; when one carries a public code or a published end date, it goes up here with its source. The affiliate program exists (signup via their affiliate portal) but publishes no commission rates, so it is not listed as an offer.