Humming sound from rear Right

[Indusbreed]

Lately, i have been hearing slight humming noise coming from the rear right side of my Mazda3 GS 2005 sedan.
I am not sure if this is a tire noise or bearing issue. Anyone know how much is the cost for the Bearing Job at the dealership?

IB

[poke65]

I just had Jimmy (street Performance) do mine 2 days ago front bearing and install was under 300 (Bearing bought with TM3 discount)
Not sure how much at a dealership though but I do know it would be a heck of a lot more