Does anybody know a ballpark figure on how much the minting and hologram would cost?
Do you guys think there is a market for 100 Bars and what would the price need to be to sell them?
Minting 100 1oz silver bars with holograms would likely cost you between $2,900-$6,200 depending on the type/quality of the dies and holograms.
Looking at recent market resales, I'd say they'd likely sell in the $40-$100 range depending on if there's any additional features or infrastructure.
My advice, don't do it if it's something you want to do strictly for profit. You will likely be disappointed and would be better off speculating on Bitcoin. If it's something you've always wanted to do, you want the experience, or you think you will enjoy it, go for it!