The most sold and loved DIY 3D Printer kit is definately the Tarantula from TEVO. It is sold via resellers or you can get it direct from the producer secure and quick via Aliexpress for around 200USD (DHL Express worldwide included). I would suggest to buy it only from producer direct as all others only dropship and some even don`t give support. Here is the producers shop at Aliexpress - so when get one buy here:
http://s.click.aliexpress.com/e/neY7yRf6e
Often copied (for same price) but competitiors simple never reached the quality and their top of the industry owners community make their machines stand out of others. Their basis printer is the mentioned Tarantula what was sold about 50k times and there is an unbeatable owners group of facebook with 21k owners of that machine.
So even if you are scared to build your own one - there are videos and a massive community what managed to get everyone running, from learning even not spoken. So join that group of professionals:
https://www.facebook.com/groups/TEVO.3dprinter.owners/
If you own already that machine (like title would mean) please dont hesitate to watch the FAQ video by Rui Raptor:
Hope you liked it - if you want to read more about 3D printing please follow my account and read my guide I write:
https://steemit.com/technology/@hastla/4j3h3c-3d-printing-guide-1-0-overview