Have trying to use DS18B20 sensors but they are all from ALiexpress and fakes. They worked maximum for few month and die or send erratic readings and then finaly die 
I looked to buy original Maxim sensors but seems that is impossible to buy just few pieces and send them to Croatia. So, can someone give me advice for similar chip? I need it for measuring range from -20 to +60, mostly use more than one sensor with one ESP board, low cost (>10euro/pcs.). Or give me where to buy 100% original chips (to 10 pcs.)?
Mouser or Farnell. Two of the largest electronic componant distributors in the world. They only sell original components. You can buy any amount from single units to hundreds of thousands. Both have Croatian sites (or worst case, just use their EU site).
The DS18b20 is like 7 euro I think, I bought a bunch from Mouser a couple of months ago. More expensive than the crap on Ali, but at least they’re the real thing.
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My 7 Dallas are very reliable. I managed to get one up to 25m but it took a lot of fiddling to make it work over that distance
Have tried ordering from them but price for delivery is 20 euro on Mouser and 27 pounds on Farnell. It is too expensive for me 
Sorry @JulianDH but this topic is not about experience with DS’s but for exchanging information’s how to get same results without chinese copy’s of DS18B20
The four I purchased from this supplier have been working for over a year without issue (3m leads):
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I guess that you have an electronic shop near you? call them and if they buy from farnell or mouser then order sensor there and they will order it for you. In my city there are a few electronic components stores and all you need is to send them farnell or mouser order number. So far they never charged me postage (i pick up stuff myself in their store), because they order a bunch of stuff weekly (or even more frequently) in any case. Usually i get stuff within a week.
I had to go back and see where I purchased all mine from. Last five came from AliExpress 9 months ago. And all working externally in damp wet conditions. They are no longer available on the AliExpress listing but there are so many alternatives on AliExpress and they are super cheap.
The other ones that have been going for a few years are in the ultimate test as one is down a water tank and the other is built into the front of the building fascia… so my fault but when it fails(!) I will have a problem!. I cant find where I purchased them from but I suspect one of the automation shops about four years ago!
I see PiHut has some cheap versions.
Last batch was bought from 3 different sellers year ago. It worked properly for six months and then irregularly send data (readings was every 5 mins.) and than stopped send data, all of them.
It is not worthy to buy from China
Unfortunately, I live in small town and there is no shop in my neighborhood. There is one in town nearby but they didn’t reply to my answer so I guess they don’t know are they sell original chips. I asked at Aswo shop but same reply there…no reply
Update! 
Have received to test few DS18b20 from ASWO shop. Aswo have shops in almost all European countries.
Tested it and is has address
0xcf00000df74b7128
Also is responding to change of resolution so I think that is a genuine part. Price is 5 euro/pcs.