on my k11, last time I asked the local shop to source & replace the hub bearing only costed bout £40, removed & fitted the hub myself.
down at the scrappys I brought a pair of used k11 hubs for £20.
sometimes sourcing a used complete hub with non-excessive play (check it personally) might be more economical than the labour of fitting an expensive shiny new bearing.
get quotes of new bearings vs new hub & compare