A shortage of engineers willing to work for Musk-led companies, maybe. Tesla is well-known in tech circles to have awful work culture. You can only survive with high turnover like that for so long before most American engineers know that there are much greener pastures.
I’ve found that a lot of stuff listed on Amazon is about the price of shipping higher than it is on eBay I guess to account for the free Prime shipping. If you don’t have Prime, there really isn’t much reason to not use eBay since you’d be getting doubly screwed without the free shipping on Amazon.