Most butchers can sort beef and lamb fat for you if you ask in advance, we also have a S/A butcher close by that does pork fat - $10/kg seems to be the going rate for both
Normal sausages we go for 15% - 20% fat. Places online like Sausages by Design, Oskar Butcher etc have some good recipes on their web pages for free.
What started out as making our own bangers has turned into making cured/dried chorizo and salami now using a mix of venison and pork shoulder, quite a learning curve.
Cheers.
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