How about preloved? You can often get great prices for preloved stuff, pennies for whole outfits, and if you look around you can find organic stuff too. People tend to look after the more expensive organic baby clothes really well so it could be great - not only organic but reused too
I've bought some stuff on here, just parenting forums generally really, the same places I'd buy preloved nappies. People selling nappies quite often have nice organic clothes too, so you could try clothnappytree, naturalmamas etc.
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