I always use the cheapest ebay ones. The last lot ended up being branded as Dunlop – seem decent.
Usually about 2-2.50 each.
Search for 71902 bearing.
knock the old ones out with a hammer and drift (make sure you tap the bearing and not the snap ring which limits how far into the BB shell the bearing can be pushed.
I then use a press at work, or a vice to push the new bearings in – using the old one as ‘tool’ on top of the new bearing to push it into the slight recess in the BB shell.
EDIT – it’s also worth popping the seals off the new bearings with a tiny flat jewelry screwdriver and ram them as full of grease as you can get them.