I've used the Grovia AIO and really like it, the AI2 version is organic cotton too and can work out cheaper.
BG do an organic version which is now meant to be called the elemental but they are about £17/£18
Pop-in does a bamboo version, the new ones are around £15 but the old style are super cheap atm, they are I guess officially an AI2 but you can use them just like an AIO.
Same with a Flip with organic cotton insert, it's an AI2 officially but goes on like an AIO.
Nothing else that has entirely natural springs to mind.
I've got a spare Grovia AIO, AI2 and BG elemental that I dont mind parting with you you want to try them preloved first xx