Trezor is the honest negative in this category: the company states it does not offer discount codes. Their support article says promotions are announced through the newsletter, blog and social channels instead - there is no code to type, ever. We record that as the standing state rather than inventing a "deal".
What Trezor does run are bundles. The current one documented in their official store is the Trezor Safe 5 Backup Bundle at $228 USD (Safe 5 plus a Keep Metal 20-word backup), listed as a standing product - the store's own schema marks it with a far-future validity date, meaning it is not a timed promotion.
Practical takeaway
If you want a discount on a Trezor, the realistic paths are the newsletter (where timed promos get announced) and bundles like the Safe 5 + Keep Metal combination, which bundle two products at a lower combined price than buying separately.
Re-check
We re-check trezor.io daily. If Trezor ever introduces checkout codes, the store page is where they would appear first.