I got diamond files, mag bases and DTIs from ali Express. nothing spectacular but I use them. Most of my tools are high quality but you just need to make a judgement call about how much you'll use them and what quality results you expect. All I'd warn you about tools from Ali is that there isn't much consistency.
As PaulNZ said VERTEX is quite reasonable in price and very consistent, I used to use their clamp sets, vices & parallels when setting up a cnc mill and had no issues with them even when operators abused them.
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