12v AC relay - few and far between?

Looking for a 12v AC relay - these seem to be non-existant in my desired price bracket (about £3 max each + P&P). Is this my bad or…?
Basically wanting to “read” a pre existing doorbell circuit. Thanks all

(I think I’m just going to buy a bridge rectifier)

Have you considered a voltage/current/hall sensor?

Or opto isolator?

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