Gearbox, transfer box and Diff oil

Having searched threads and googled I have determined that I should use EP 90 GL4 oil for my Series III but can anyone recommend a supplier.

eBay - Smith & Allan EP 90 Gear Oil API GL4 5Ltr is GBP13.80 shipped but is it any good?

Opie Oils - does Millers Oils EP 80w-90 GL4 high quality gear oil-5 Litres for GBP24.46 shipped

supplyshed - does Granville EP90 GL4 5Ltr for GBP 28.35 shipped

Or do you know somewhere better?

TIA

David

Ive never used that type of Smith and Allen oil as yet - but their paints and other oils Ive used have all been good. Not got any complaints. And the guys in the shop are ok to deal with too.