I’ve worn out some cheap tools in just a few years. Here’s my cheapo tips. Others will be along sharpish to contradict totally!
General ratchets, including hex bolts, sockets and stuff to work on your car: B&Q Magnessun. Usually 1/2 price, sometimes 1/3. I got a mad tool set 3 years ago for about £40 that I’ve yet to find a shortcoming with.
BB Tool- Check Probikebit. Currently 70% off (apparently).
Chainwhip tool – got a cheap one and realised I needed 2 to get a cassette off a hope freehub.
Ext BB took. Dont buy the Merlin saucer shaped thing. It slips. Get a proper tool with a big handle.
Chainring bolt tool – you dont know you need one til you need one. Again probikebit.
Cable cutter: Screwfix
Crimps – I had one of these lying around from electrictal work.
Needle nose pliers. Again Magnesson.
Chunky pliers – anything might do.
A 1/2 – 3/8 – 1/4 adapter set. Around £2 on ebay. Invaluable if you ever borrow tools. Or a complete wast of £2 otherwise.
Screwdriers – why not get something that will do you a lifetime in the house / car?
Edit- I’ve just checked and B&Q no no longer do the Magnusson range. So scrap most of the above 🙁