The rear wheel bearings in a 2003 Buick Rendezvous are integrated with the hub, therefore they are only available/replaceable as an entire hub assembly. The rear hub assembly costs around $200/each, depending on the specifics of the vehicle (2WD or 4WD).
I purchased the bearings and had my repair man do it. Very reasonable about $200
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You can change the front wheel bearings on your 2000 Buick Regal without replacing the entire hub assembly. You can change each individual wheel bearing, if you choose.
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Take your door panel off and replace them...
remove gas tank and replace fuel pump