It depends on what you're looking for.
If you only want to have the newest hottest stuff that has only just arrived from SL (Legacy, LaraX etc.), then you're out of luck. It's generally offered exclusively with limited perms and with no boxes.
But if what you're looking for includes older content, there are quite a few shops that offer them by boxes. Yes, quite a few boxes may have been god-moded to make this possible.
For starters, there's the Freebie Store 2024 in AviWorlds.
https://opensimworld.com/hop/84040
It offers a lot of stuff, including older things that are increasingly hard to come by while still being useful. But especially the older areas have content for all kinds of avatars/bodies mixed like Adonis clothes next to Apollo clothes next to mesh clothes rigged for the system body next to layer clothes.
Carpe Noctem can take a while to browse with its many shops, but it's quite organised.
https://opensimworld.com/hop/87491
Another classic with lots of boxes to copy: The Spoiled Diva Freebbie Store.
https://opensimworld.com/hop/85055
The biggest selection by far has to be at Stark North District.
https://opensimworld.com/hop/89605
In theory, everything is neatly organised into themed stores. But it's so much stuff that the stores tend to be cluttered, and not everything is in the store it belongs into, also because there is no store dedicated to the system body. Still, you're likely to find things that are really hard to find.
Lastly, maybe I can help you out with some older items myself, especially things that are or used to be able at Klamotto.