Looking for ecovillage/non profit for room & Board for work experience in the USA

Hi, my names Raj and I've applied for internships and room and board for work, to gain some experience in agriculture and working with animals in the USA. I was wondering does anyone here take room and board for work in the US? I can probably stay max 3 months, with a normal visa, for a person from the UK, but there non profits out the which have longer durations. I have no commitments here, so I am able to go any time, but I like to get a spot for the longest duration as possible so I could to get the full work experience. If anyone has any open opportunities or know of any non profits that would take over sea's worker from the UK please get in touch. Thanks.