That’s normal biz.
When I was a kid working a off season (Christmas time) job at the old “Sterns” stores (They were like Sears or JC Penny) I was in the back store room moving goods around to put out for there sales for Christmas.
A box loaded with suites the store routinely sold for $100 we’re lined up to be opened up and readied for sale. The packaging invoice was still on the boxes.
Stearns sold each suite with the “On Sale” price of $100 & the invoice clear stated each suite cost them $10!
This was found to be the norm not only in Stearns but other stores as well that I worked at when I was younger. That’s mark up and that’s normal.
Go get friendly with a actual car dealer owner. Be prepared to throw up at mark up.
If the guy your dealing with has a $100 mark up, that’s his biz. But I doubt it even if you share everything with him. I don’t care how close you are to him or how great of a good fella you believe he is. If those heads sell for $3500 from Trick Flow, then on the shelf they will sit.
Of course, there is always the fool with more money than brains.