bearings for mtb wheels on a 10mm axle
nsk 16100-2rs $30 for ten | datasheet
bearings for skate wheels on a 8mm axle
ntn 608-llu $19.95 for ten | datasheet
(didn’t mean to respond to anyone in particular. up to y’all if you want to buy repackaged bearings from a distributor who doesn’t disclose their oem source, or just buy bearings from folks who design and engineer their own bearings)