I'm a bit surprised to read your comment about the NewerTech replacement battery, what was wrong?? The one I purchased many years ago (G3 or G4??? macbook era) was excellent.
Anyway, the last battery I purchased was from an ebay.ca seller multi-function1002 it seems for my old 2007 MBPro and shipped from: Item location: QC, Canada. Aprox: $35.00±cdn Free shipping, And no prov taxes!!!
Very reasonable price and good battery specs, even after several months but also very low usage.