Look for #8 flat heads that are tamper proof / security screws.  But for wood.  You can find all the machine screws and sheet metals screws. But i can’t find an ones for wood.  Anyone have a source?

How many do you need? If the quantities are large I would contact the industrial fastener manufacturing trade association.  They should be able to direct you to a manufacturer.  The manufacturer should be able to direct you to an appropriate distributor.  But even then, I doubt any of these sources would be good for a couple of dozen screws. 

https://www.fastenermanufacturers.org/more-fastener-manufacturer-listings/

The organization will also submit requests for quotation on your behalf.  But again the quantities would have to be substantial.

https://www.fastenermanufacturers.org/request-for-quote/