http://www.amazon.com/dp/B017BVLLC6
I use this, people claim it is the original OEM charger rebranded. Choetech also make good ones.
I left verizon in november, couldnt be happier. service with verizon was a bit better, but wifi is fine where service is bad.
I had no problems
I also like to have a fuck ton of charging options everywhere I go, rather than keep one with me all the time. you could do the adapter route that you linked to, just know you will be limited to 1.5 amps no matter what amp charger you use, its by design of the 6p. for usb c cables, chargers and misc, look at this spreadsheet https://docs.google.com/spreadsheets/d/1wJwqv3rTNmORXz-XJsQaXK1dl8I91V4-eP_sfNVNzbA/edit#gid=0&vpid=A2
I hated the idea of charging so much slower, so I bought one of these
http://www.amazon.com/gp/product/B017BVLLC6?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
and one of these http://www.amazon.com/gp/product/B017I7EX46?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00 for ac charging
one of these http://www.amazon.com/gp/product/B014F2NQ36?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s02 for car charging
and this for portable charging http://www.amazon.com/gp/product/B0156HCJQO?psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s01
it gives me 3.5 charges
I have this one. It looks identical to the huawei charger that came with the phone, and works just as good.
Not under $10 unfortunately but this was the closest one I found outside of the stock OEM 5x wall adapter :
$16 / SONEic - USB Type-C (USB-C) Rapid Wall Charger, 15 Watt/3.0 Amp (3A) for Nexus 5X/6P
www.amazon.com/SONEic-Charger-Nextbit-Devices-Included/dp/B017BVLLC6/
I wouldn't order the cable with it (charger only) and use one of the approved USB C/C-A cables instead.
It's still en route to me and only have this as a backup for another room... I based my selection through the amazon reviews I felt were most legit. It's really a pain in the butt to know who's genuinely reviewing on amazon despite some listed as verified purchases and sometimes you have to go through each reviewer's other reviews to get a better idea.