Any old flower pots?
They don't have to be fancy, but if you have any old pots, like the plastic ones, 8+ inches/ 20+cm diameter then I'd be happy to come and collect. I'm looking for 30+ but am happy to get a few from anyone.
I'm based to the South-East of Brussels, in Nethen.
I'm happy to swop for young plants (or cheese...) - maybe an okra plant, moringa, aji amarillo, chocolate habanero... - if you have a dozen or so.