Reddit mentions of AmazonBasics 100 Millimeter Bocce Ball Outdoor Yard Games Set with Soft Carrying Case - 2 to 8 Players, Red and Green

The difference is pharmacies have generics of general popular items, there's only so many of them and the risk of the items not being purchased at one point or another is relatively slim. However Amazon is taking it to the next level and going beyond stuff like batteries, electronics cables, and getting into making oddly specific targeted objects like a bocce ball set, specific refrigerator water filters for a variety of brands, Male dog wraps, and tons of other fairly random things that would be considered risky products unless you have gathered the data from other sellers over time. Then they swoop in and capture that market by undercutting and promoting their brand over their competitors.

Unlike normal stores, the burden of the sale is placed on the seller rather than Amazon. Unlike Target/Walmart/Costco/CVS/Walgreens and etc, they don't purchase the items for their inventory to sell. Rather they have the sellers ship it to Amazon and when sold, they ship it assuming they do Fulfillment by Amazon give the money minus their cut or have you ship it out and then you get the cut. All the risk is on the seller if it doesn't sell. The seller won't ever see a dime even if the inventory is no longer in their hands and is in Amazon's instead. It's this that makes it different from the standard generic products in local stores, at least the other manufacturers still get money for their products even if it isn't sold to consumers.