http://www.amazon.com/Samsung-EP-TA10JWEQBUS-2-0-Amp-Micro-USB-Charger/dp/B00GDFAL5U/ref=sr_1_8?s=wireless&ie=UTF8&qid=1445997657&sr=1-8&keywords=Samsung+charger It's Original

I bought this one and use it at work

Amazon

Is it OEM? Probably not.

It does charge just as fast though so I'm happy with it. I'm unaware of any downsides to not using an OEM charger, but I've yet to see any.

I don't know what you're talking about with amazon. Mine works fine.

Samsung EP-TA10JWEQBUS 2.0-Amp Micro-USB 3.0 Charger with 4ft Cable for Samsung Galaxy S5, Note 3 - White https://www.amazon.com/dp/B00GDFAL5U/ref=cm_sw_r_awd_A4tmwb05TPB4X