McMaster Carr. They have it all. As a maintenence dept we get anything from cleaning supplies, plumbing supplies, pneumatic supplies, safety supplies, some of our electrical supplies and much more from them.
Try to get a catalog from them however. It is a real catalog/reference book but many people cannot get them to send one. You cannot even buy the catalog from them. If you are on their list you will get them regularly for free. But if you are not, you will likely never get one free or paid. I sell my used ones one Ebay when I get a new one. Sold one a year ago for 100 bucks.
