Shortage, I did read about someone getting their Dirtworx bumper(s) from eBay, so you're correct in thinking they were on eBay, at least once. I don't see them there now.
I emailed Robert several times with my own questions regarding his bumpers, and he graciously answered them pretty quickly. What he told me was:
1. The bumpers, as shown in the photos on his site, weigh around 45 lbs. each. Front with d-ring mounts & hoops, rear with d-ring mounts. The rear with tire carrier is 75-85 lbs per Robert.
2. The front bumper can be ordered without the hoops, it would be $150. So for $300, one could get both front & rear bumpers, + shipping.
Here's my 'paint' rendition of what a front bumper might look like without the hoops (sent this to Robert, he sort of laughed, I got an LOL out Robert):
Now I just have to decide if I want the hoops or not, and whether to shorten the front bumper a bit, or leave it as is, at 53"...any opinions?