My suggestion would be to go take your bearings out and take them to the nearest local bearing supply place and see what they can do.
I say take them out as they may need to measure with a vernier or similar to get the right bearing for you.
Eriks or Brammer are national companies and should have a branch reasonably close by. Might be worth speaking to some friends to see if you can ‘use’ their account to get discount too.
As an example I got freehub bearings (SKF for those that are wondering) for my fulcrum wheels recently for a just over £11, cheapest ‘specific’ fulcrum bearings I could find were £20.
As for brand of bearings, SKF or INA would be my choices.