I used to buy mine from Mike Vincent at south coast marine in Christchurch. It depends on where you live. If you can collect it's much cheaper as it's classed as hazardous goods & carriage is expensive.
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Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll