OEM 42450-47040 2010-15 HUB & BEARING ASSY, REAR AXLE, RH or LH

My passengers are indicating that there is a noise, which indicates the right rear bearing assembly needs to be replaced.

1) What is the decision process / inputs to decide between OEM ($180- $440) vs aftermarket ($60 eBay/ AMZN)?

2) If buying OEM through eBay, what is the litmus test to verify it is truly OEM?

42450-47040 TOYOTA GENUINE PRUIS 2010-15 HUB & BEARING ASSY, REAR AXLE, RH or LH | eBay

3) If buying online from a Toyota parts center, the incremental cost is approximately $100 over eBay.
If you have replaced said assembly, what was your experience? Please indicate if you bought OEM, where you bought it from and the cost. If you were faced with the decision again, would you do it differently?