durango wheel bearings ADVICE PLEASE!

From : news

Q: i posted earlier about a buzzing coming from the front and after reading the replies i decided that the problem is probably the bearings. when i turn the car right the buzzing stops but when i turn it left it keeps going. which wheel does this mean is causing the noise also i couldnt find the bearings anywhere online or at any auto parts store and when i called the dealer they said that they were like $310! its a 1998 4wd 5.9l rear wheel abs if that helps. can someone give me advice thanks matt .