Purty sure it will have to come from either Dillon or Brian Enos/Krakenpop.
Don't recall anyone else selling new Dillon products.
Used stuff can show up on the internet gun auctions, though.
P.S.
Apparently Graf and Sons also sells Dillon products.
Dillon doesn't distribute like most companies. Don't know for a fact but I wonder if the "other" sellers even have any of their products in inventory or do they just forward the order on to Dillon. Don't know and there is certainly nothing wrong with doing that. Just don't waste time searching the web looking a lower price.