There are still many sources for USA made tools in the US.
You have Proto, Snap-on, Matco, Cornwell, Wright, SK, Enderes, Wilde, Williams etc.
As a former Snap-on rep, I've come to know what a quality tool is. There are a few awesome online retailers that I buy odd ball stuff from. But hands down my favourite web store besides Adams right now is Harry J. Epstein in KS. It is an old mom and pop B&M store. I believe it is 3rd generation owned right now. Country of Origin is clearly marked on every item on their web store. Take a look around their site. You would be amazed how many tools are still made in the USA by little known brands. Epstein is definitely a hidden jewel.