Heavy duty plastic crates
Anyone know where I can obtain about 3 of those heavy duty rigid plastic crates in London that nurseries and garden centres use? Garden centres won't part with them even at at a price. I saw some online today at £7 each, but £45 for postage - no way!
This pic is from an Australian site.

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The crates are discarded at the edge of the pavement, as commercial rubbish, next to the road for daily collection by the bin men. Be brazen and just pick up a few.
Have a scout around the back of shops, greengrocers, and bakeries. Super markets usually have a fairly efficient recycling system but you may be lucky. The crates will probably not match, depends on how particular you are about them being the same.