I have used ctc in china for lathe / mill tooling – they make good stuff at reasonable cost although shipping was a little expensive but it was insured and shipped by tolls and hit my doorstep inside 48hrs so the $50 delivery seemed reasonable – trick is to fill up with as much product you can fit into the weight window so you get the best bang for your buck . There seems to be a proliferation of Aussie youtubers doing reviews on the gear from bangood , i haven't used them yet but so far from what i have seen these youtubers have been pretty happy with the gear they bought .
Engineering supplies is a pretty broad subject and covers a lot of different catagories , i buy a fair bit of stuff from blackwoods but things like taps and dies , cutting tools and measuring tools came from ebay but you need to know what something is worth new so you can see if it is a bargain or a rip off .
Hare and forbes love me ! Although i am now at the point where i have already made my major purchases from them and usually only buy bits and pieces from them now .
And as usual the standard disclaimer applies for the companies i have mentioned !