Erg, yeah I wouldnt bother with them anymore! Im not a fan of garages who have the attitude of well we could try this and that and that... just ends up costing a fortune. Better to take it to a specialist and just pay a little bit more once, instead of paying less 4 times! haha.
If it is the wheel bearing you should be fine to drive it to the garage assuming there is only a slight humming at the moment, they get very noticable when there completly shot.