Cheap 4mm 'banana' connectors

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Re-purpose 4mm 'bullet' connectors to fit into 4mm banana female connectors.

1

Observe

Take a standard male 4mm bullet connector, you'll see it's a sloppy loose fit in a 4mm banana female connector.
2

Fettle

Take a scalpel or craft knife and run it along the 'split' in the metal where it's folded round, and open it up about 1mm. It will then be a tight fit.
3

Save like scrooge mc duck!

As bullet connectors are about $0.04 each (or less) it's a significant saving over buying standard banana connectors, or for use in an emergency if you've run out.