Have a Price List that's down loadable, this could include stock levels
By doing this Trade customers can up load the price list to thier websites and not have to manually trawl your site or set-up Scrapping software to skin your site for prices and stock levels.
When you discount on products Trade customers more often will have to stop sell the product as the retail price becomes the trade price, i.e no margin for traders.
Buy having a price list that has the trade price, your current price and stock levels trade customer would be able to adjust weekly there product offering.
Nearly all E Commerce sites have the ability to offer price lists within the Admin area and make this list available to download via a URL.
What do you think?