If you've actually read Benson or Nathan K's reviews you should've easily spotted some affordable alternatives... The spreadsheets make it more confusing than it really is to find some decent stuff IMO, specially since they aren't totally updated or detailed.
Benson's Amazon profile, or his G+ page, or Nathan's, are easier to follow but it does involve more reading... Nathan K even has a "Light" section on his G+ page for those that don't wanna do a ton of reading tho.
In any case, I'll synthesize what I think are some of the better yet affordable options in case it helps anyone else. You can save $3-4 by going with a separate (albeit shorter) cable and charger, but I still maintain that the $35 18W charger + 6ft cable shipped free straight from Google is actually a pretty solid value.
https://forums.androidcentral.com/e.../store.google.com/us/?hl=en-US&token=VLqn_n-G
If you wanna save those $3-4 or you need a charger but not a cable (or vice versa), then take a look at these):
http://www.amazon.com/gp/aw/d/B017V7SI30/?tag=hawk-future-20&ascsubtag=UUacUvbUpU5537635
http://www.amazon.com/gp/aw/d/B01GVDVEMM/?tag=hawk-future-20&ascsubtag=UUacUvbUpU5537635
You can save another $3 or so if you track down a USB 2.0 Type C cable instead, but honestly, why bother? I guess in some cases one may want a fancier looking or slightly better built cable than the Black Squid (braided etc), but you're probably gonna end up paying more for that regardless...
There's actually more decent car charger out there than AC chargers, Benson was using that Nekteck for a while as his personal charger and I think it's still one of the better ones overall, particularly if you want to charge two things at once which I think is a fairly common need:
http://www.amazon.com/gp/aw/d/B01CH9NEM2/?tag=hawk-future-20&ascsubtag=UUacUvbUpU5537635
It's cheap, well built (I have both it and the Vinsic), and comes with a built in cable in your choice of coiled or not. If it wasn't so cheap and/or a single port I'd take issue with the permanently attached cable, but at $16 it's not much more expensive than a decent cable anyway!
So that's your AC and car charging beds needs covered... The phone comes with a USB 3.1 A to C cable and an OTG adapter (which isn't technically OTG anymore but nevermind that). I doubt most people need extras of those right away...
I bought two of the longer/flexible Type C to female A adapter by Google because I thought $12 wasn't too bad and there were no third party adapters with detailed reviews. Bought an extra Type C to A cable too but that one IS overpriced at $25 IMO, I just didn't care to keep scouring reviews.
When in doubt, or if you're really broke, just get Anker's two pack of micro USB to Type C adapters, they're well reviewed by Benson and only like $7. You can safely use any old charger/cable with those, you just won't get the absolute fastest charging rear or data transfer speed.
Beats buying spec violating stuff that might fry your $700 phone or charger... I intend to use one of those adapters with my old USB power pack for now, because decent Type C power packs are almost non existent right now.