Almost everything is available on Ebay. And any problems are not with Ebay, but with particular sellers. Most of the sellers there, by far, are honest.
I got my 550 when suggested retail was $300. I didn't get any extras except the spare parts kit, the maintenance kit, and some extra primer tubes. I already owned dies but eventually got Dillon dies. I've got under $400 in the press.
Anybody that questions the quality of these units simply has never owned one. In their class, they are the best money can buy. Customer service is superb. Materials and workmanship are better than we ordinarily expect from machinery in this price range.