608 is the cheapest bearing I have come across. It is used on skateboards. 10PCs 608zz Deep Groove Ball Bearing Carbon Steel For Skateboard Roller Blade | eBay
It was also used on the fan motor on my wood heater.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.