I had a friend who got a good deal on an ignition coil pack on eBay. He had a 12V VR6, and replacement coil packs are insanely expensive at stores, even for a mysterious discount brand.
There is a little of everything on EBAY. I have found some Mopar stuff on EBAY, someone must have ordered something he did not need or a vehicle is getting old and the dealer is cutting back on the number of parts for that year. Then there is a lot of junk. I got 4 Blistein shocks for my Jeep on EBAY.