For stuff like specific metal flat bar, rods, etc, there is no better place?

Like if you want to select from different types of metal and know what the
tolerance is, they make it super easy. And it's all there. Some prices are
high, and the shipping is a bit much, but I can't find stuff like that
elsewhere. Amazon cannot hold a candle to McMaster Carr when it comes to
selection and information.

I tried (onlinemetals.com) years ago but it seems they radically raised their
shipping prices since then.