For what it's worth, i bought a bottom panel on ebay for about $28 and swapped it myself. Small components like this are never a good deal from the OEM, regardless of brand. Same deal with cars, pick it up from the junkyard.
https://www.amazon.com/Self-adhesive-Bumpers-Devices-Project...
I mean, it's not exactly an ultra-complex piece of kit. It's a piece of rubber with some adhesive on the back. They probably cost less than a cent each to make.