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I went to my local GC, the fishpond section, and asked if they did a discount if I wanted fifty of one size. Got 20% off - might be worth asking if you want to buy over the counter.
I figure I could use about 40 pots straight away and then more as time goes by. I don't know how many constitute a bulk order but I would be interested in any price information that Emma or anybody else can glean.