Coinkite (COLDCARD) runs a rare thing in hardware wallets: a public sitewide promo code. "Save 5% with Bitcoin. Use promo code CKBTC at checkout. On-chain payments only." The code applies when you pay with on-chain Bitcoin - Lightning purchases do not get the discount, per the on-page wording.
On top of the code, the store is running a price drop: the COLDCARD Q is listed at $319 USD (regular $369) and the Mk5 at $219 (regular $269), shown as strikethrough prices on the homepage and every product page. No end date is published for either the code or the sale.
How to redeem
Add the wallet to the cart at store.coinkite.com, choose on-chain Bitcoin at checkout, and enter CKBTC in the promo field. The 5% comes off the Bitcoin price.
What we watch for
Coinkite's store is re-checked daily. Note that this store (Coldcard / Coinkite) covers the COLDCARD product line; Coinkite's other products (Blockclock, Tapsigner) share the same store and the same code.