Exotic merchant code cashback
I know that probably this topic is probably going to be difficult, but I wonder if there's any information about more rare merchant code cashback on any cards (excluding classic "everything else" cards).
The things that I have in mind:
* Duty free stores
* Drugmart - increasingly becomes rare category due to constant devaluation on premium cards?
* Dental - perhaps, completely unrealistic?!
* Casino - well, I guess nope.jpg, but out of curiosity I would be amazed to know if there's any targeted cashback ever for such lol
* Postal services - I could imagine existence of such, but never seen myself. FedEx/CanadaPost tagretted cashback?
* Staples-home office like - except of Tangerine and more targeted CT I'm not sure if there's any, but would be good to know
* Discount stores - perhaps, only targeted offers by cards of Walmart, Brim, Neo, Tangerine and Costco fit in this? Correct me if I'm wrong about what belongs to this category anyway
* Furniture - probably only Tangerine?
Less interesting due to wide coverage by Travel cards:
* Travel airlines - what merchant codes even considered to be travel and does it include duty free stores?
* Car rentals/hotel bookings - is it all brand-based only or there's any example like "one card that would include all merchant codes" of those categories?
Overall, it would be interesting to have some compendium of such exotic categories for rare shopper.