Rare as rocking-horse poo
Almost impossible to find.
Person 1"Find a park near the beach?"
Person 2"On a Sunday? Rare as rocking-horse poo."
You'll also hear
Rare as chicken lipssame idea
Scarce as hen's teetholder version
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While you're here
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Extremely thirsty. Also used for weather that has not seen rain in months.
Completely full, usually after a big feed. Sometimes used for very drunk.
Showing off and very pleased with yourself.
Extremely happy.
Get loud and rowdy, usually said of a party or a crowd. Also used for someone losing their temper.