Bearing replacement is low cost and cost effective if you disassemble the unit and bring it to a shop. You do need special tools, but it's not really cost effective to buy them.
I've had bearings replaced on 30 year old shop vac, reciprocating saws, drills, etc.. Each time under $20.00, as I just handed them the part with the bearing(s) attached.
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759