An unexpected source for discount tools is American Science and Surplus, or their website, SciPlus.com.

Because they carry true surplus, supplies vary and are limited, so if you see something you like, snap it up. They often have files, pliers and brass and copper tubing. And just cool stuff that may inspire you in unexpected ways.

The selection is so vast on the website, I suggest you request the paper catalog for easier shopping. And as a bonus, the catalog is funny!