Asian and Hispanic markets (like Lee Lees or local bodegas) frequently stock large slabs of back fat or pork belly with high fat content.
This is your best bet. Many butchers use their trimmings for sausage, so you might need to pre-order a few days in advance. buy pork back fat
Retailers like ButcherBox Canada or Plumb Rocky Farm ship specific fat cuts directly to your door. How to Judge Quality Asian and Hispanic markets (like Lee Lees or
Sites like Caterite or Sysco carry bulk quantities, which are ideal if you are making large batches of sausage. buy pork back fat