I see a fair number of GEN1's in junk yards with minor damage to the rear bumper. I think these have failed hazard switches and were involved in a rear collision due to non-operating brake lights.

I was able to get a replacement unit through RockAuto P/N 1S13545. I believe you can setup a notification when they are in-stock.

I've also seen a newer aftermarket style but don't recall the brand and am not sure how plug&play these are, but others have used them.

Although price is steep, seems like a worthwile investment considering the failure modes