I haven't heard of anything like that.
But Discover does have special offers for cruises through ShopDiscover on Royal Caribbean, Celebrity, Crystal, Cunard, Carinval, Holland America, and Norwegian Cruiselines. And they all earn 5% cashback.
Discover IT $35K | FNBO Visa $30K | Cash+ Visa Sig $19.5K | Southwest Premier $16K | Priceline $15K | Citi Forward $14.3K | US Bank Plat $14K | Commerce Bank $13K | CSP $13K | CSR $10K | Sallie Mae World MC $10K | Lowe’s Consumer 10K | BoA Cash Rewards 1-2-3 Sig $7.5K | Fidelity Visa $7K | Citi Double Cash $6.5K | WF Cash Back Visa $5.4K | Capital One Cash Rewards $5K | AMEX BCE $3.9K | Freedom $2.5K | Younkers/Comenity $2.4K | Kohl’s 1.5K | Target $1.4K | EX FICO (from AMEX): 768, TU FICO (from Discover): 797, AAoA: 4.4 years
