Another idea is old pallets. You will very often find them heaped up around transport depots. Quite a few are deposit charged, but the majority end up being burned. If you don't mind a) carting them home (or to plot) and b) taking them apart, they do make pretty good fencing, raised bed edging, compost bins etc. I've even made chairs out of 'em! Handy for tea break.

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Zebedee
"Raised to a state of heavenly lunacy where I just can't be touched!"