system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why stores like The 99¢ Store are able to sell products that you can find at regular grocery stores, but much cheaper?
gpt
Many of these stores stock items that are already available for around $1 at regular grocery stores in the first place.

Another reason is that you usually don't see the big name brands stocked at dollar stores.  They sell generic brands, which can afford to sell for cheap.  

Another reason is that if a store wasn't able to sell those items, they will turn to the dollar stores to help them sell the overstocked items for cheap.