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I have a couple of pairs, one Anker ones, one some similar make and they're fine for the price. They're not amazing sound but perfectly serviceable for running.
The alternative is something like https://www.amazon.co.uk/FiiO-BTR1-Bluetooth-Headphone-Amp/dp/B075YD83Y9 and just connect wired headphones to them. I use a similar thing with headphones with a short cable and they work well, finding headphones with a short cable is a hassle though.
Yeah I saw the £20 ones. I wondered how many of the reviews are legit! Maybe they are a place to start though. I really liked the iSport wired i've been using, but it seems their wireless versions aren't robust enough yet.