Retail: What are your exclusive specialities?

Great idea, I have a garden shop that sells fertilizer bags, I could add the horse manure on sale there as well. My shops are generally quite boring and I don't use them that much as I prefer to use the community space shopping because it's easier to set-up and use. I have a couple of malls that sell clothes, small gift type objects like vases, journals, bubble bottles, christmas decorations, everyday clothes, beachwear, shoes, electronics, baby furniture, toys, make-up decor, cakes and pies, lingerie and wedding dresses, music instruments, books, gems, icecream. They're mainly places where sims can go out and socialize.

Selling horse manure is such a great yet hilarious  idea. I didn't know that was even possible. 

I my game I went for the more obvious goods that are difficult to come by. My magic shops sell all spellbooks, brooms and wands so every spellcaster can choose what they need rather than the randomised vendor stalls in the magic realm. On top of that they also sell all possible potion ingredients for magic potions and herbalism recipes. No magic shop can go without ambrosia. That would be the most exclusive product on sale. 

I also have a bakery with birthday cakes and wedding cakes because sometimes my sims just want to buy them rather than bake one. I added in some bread, croissants and other baked goods as well, because that feels more realistic. I am planning on a third store to sell furniture that can be made with eco lifestyle and nifty knitting because they are great items but by default hidden in the catalogue. 

Hilarious! But genius!