I do not know if your father can get hardware at a discount but I did my research at http://www.myknobs.com/ because they have a good search engine.
I then purchased them at http://www.dlawlesshardware.com/

Both offer free shipping after a certain dollar amount. Both were a lot cheaper then Home Depot & Lowes. I needed to update the hardware on my bedroom furniture and wanted it all to match. Since I could not find furniture hardware I liked, I used kitchen cabinet handles & knobs.