During the pandemic, lots of offline shops built up a web shop, so that's where I order most stuff. Often enough, just opening up a map and looking at the shops near you, can already give you an idea. I'll also just do web searches for a product and see if any specialty, offline-first or manufacturer shops show up.

What also often works, is to look on big aggregator platforms like Amazon, Ebay, Etsy etc., but when you've found a product, then look if that brand/manufacturer has an own web store, or again via web search, if there's any other smaller stores also selling that same product. If you do that a few times, you'll usually find decent stores where it's worth looking at their other products, too.

That's kind of also what I actually like about doing this: Anyone can sell any crap or scam on Amazon et al and since you can't look at it for real, it's difficult to tell what's garbage and what's not.
These specialty/offline-first/manufacturer shops usually have a reputation/customers to lose, so they generally only sell stuff with a minimum of quality.

Also, if you order multiple products, you don't get a bazillion different packages delivered, but often rather just one, with all products combined.