A big factor in working direct with hardware manufacturers is how much volume you will sell.
In general, the biggest hardware manufacturers in the US and Europe are Assa Abloy and Allegion.
Dealing direct with them often means that there is no established distributor near by, because they have a pretty protected channel. You may find the 'official' answer from either of them is to buy via one of those existing distributor. BTW, I totally understand why this is aggravating. These distribution and dealer channels are often decades old, and it can be tough to be a 'niche' integrator just wanting decent pricing on certain products. But the big companies are often too big to worry about 'small potatoes' new accounts.
You might find better success/ pricing working through a national security door hardware distributor and negotiating discounts with them. (ie: Rocky Mountain Hardware is one example, but there are several 'big' ones)