I had a cubot from ebay recently. £120 for an octa-core phone.
Was actually very good- a little plasticky. Lots seem to have some minor issues- if they do then get it sorted asap- once you’re out of the ebay returns time and paypal dispute time then you’ll be stuck with a faulty phone (the manufacturers pay no attention to the supposed warranty they provide!). But everything else worked as it should and worked well.
But it was a great phone, great spec and great price. Mine went for a flying lesson from my pocket whilst running across a road, cracked the case and the internet stopped working properly- but it went for a big tumble so thats my fault, not the phones. I keep it as a spare now.
Try ZTE (ebay), they’re probably the biggest and most reputable of the chinese phones.
My friend also got a huwaie (spelling??) for the same spec from carphone warehouse for £120, so you don’t even need to go buying them from abroad now if you shop around.
I’ve upgraded now to a sony xperia Z1. £200 and its waterproof, metal construction, great camera. I think its worth the extra £80.