I have a customer selling products mainly from a ordinary paper catalog, when a customer buys products he must some way type in the partnumber from the catalog and if exist it goes directly into the cart. What´s the best and most easy way to do this ?

My idea is to make a kind of search field (or use the search field) where the customer types in the catalog number (unique manufacturer number) and hits a button "add to cart", then if exist it goes into cart.

Any good ideas how to add to cart from manufacturer partnumber ?

It must be a 1.9 solution.