I have both Tronsmart and Aukey quick chargers. Work great. https://www.amazon.com/Charger-Micro-USB-Blackberry-Qualcomm-Certified/dp/B00QEX83LA
Buy the aukey someone mentione here: https://www.amazon.com/Charger-Micro-USB-Blackberry-Qualcomm-Certified/dp/B00QEX83LA Uss this code - c398pph5 - it will come out to $5
[Qualcomm Certified] Aukey Quick Charge 2.0 18W USB Turbo Wall Charger Fast Charger for Samsung Galaxy S6, S6 Edge and more (Included an 20AWG 3.3ft Micro USB Cable) -Black https://www.amazon.com/dp/B00QEX83LA/ref=cm_sw_r_awd_MWJ5vbE0CQRGR
Damn, I just bought this one i thought the moto x could only do 15w.
Nice, thanks for the coupon. Any coupons for the wall charger?
https://www.amazon.com/gp/aw/d/B00QEX83LA/ref=pb_pd_lutyp_gr_1_1?pi=SS115
AUKEY Quick Charge 2.0 with cable. $12 w/ Prime. Reputable & trusted brand and you'll get it in 2 days.
If you can do Amazon and wait a few days, this is the one I have at my desk. Cheap and works great.
Any chargers with Qualcomm Quickcharge 2.0 or newer should work.
Some examples:
[Qualcomm Certified] AUKEY 18W Single Port USB Turbo Wall Charger Fast Charger with Quick Charge 2.0; Includes a 3.3ft Quick Charge Micro USB Cable; for Samsung Galaxy S6, S6 Edge and more - Black https://www.amazon.com/dp/B00QEX83LA/
[Qualcomm Quick Charge 2.0] Anker PowerPort+ 1 (QC & PowerIQ 2-in-1 Premium 18W USB Wall Charger) for Galaxy S6 / Edge / Plus, Note 5 / 4, LG G4, Nexus 6, Samsung Fast Charge Wireless Charger and More https://www.amazon.com/dp/B014F3D8FQ/
An example of multiple port charger, so you can charge your tablet with standard 2.0 amp 5V as well:
AUKEY 42W 3-Port USB Desktop Charging Station Wall Charger with Qualcomm Quick Charge 2.0 & AiPower Adaptive Charging Technology; Includes a 3.3ft Quick Charge Micro USB Cable - Black https://www.amazon.com/dp/B00VHHIUNY/
Like /u/ilessthanthreemath said, any QC 2.0 charger should be equivalent. I got the Aukey one for $15 and am very pleased with it. It's tiny (just a bit wider than the stock M8 charger) and charges my phone super quickly.
I bought this one (as an alternative to the Anker charge) and have nothing but success with the base of it (the USB cord itself may have been weak but my kids destroyed that so I had to replace it):
https://www.amazon.com/gp/product/B00QEX83LA/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1