Find somebody with a horse. Offer to clean their stall and pen periodacally. Seriously, horses make a ton of good poo, usually have wood shavings mixed in and they also waste a ton of hay because they trample it into their poo.
You will need a pickup and/or trailer for most good sources of organics for a garden your size.
Try growing mushrooms. They are supposed to break things down quickly and there is a variety of oyster mushroom that will live on conifer.
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