This is probably my favorite $100 authentic so far. I just think it looks classy, but it's nicely built as well!
https://www.vapedudes.com/the-antigo-mod

https://www.vapedudes.com/the-antigo-mod

And a copper 26650 for $109.
The Unicorn Mod - Full Copper 26650 by Overload (Serials 0001-0100) – Vape Overload
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Thank you for posting this! I really think it is a great resource and I applaud you putting it together.I thought it would be a nice idea, to start a thread of mechs that are not clones and around $100 or less. There's more all the time. Please feel free to add to the list.
Seeker (EHPro)
Seeker Copper Mod by EHpro
Workhorse and Simplicity (Super-T Manufacturing)
Super T Manufacturing
The Colonial (Mad Industries)
Matt Black Colonial Mod by Mad Industries
Nano (MMVapor)
Nanos Single tube | mmvapors.com
Helmsman (HCigar)
HCigar Helmsman 26650 Mechanical MOD - EVcigarettes.com
Alright, here's a start. I didn't list the Smok and Youde models. Maybe I'll add those later.
Just saw this list of "authentics for under 150$"
https://docs.google.com/spreadsheets/d/tIWGIY6hZ697NyT5O0mtGJw/htmlview?pli=1
I just got a Work Horse from Super-T and it is fantastic. Well worth the money. I also own several Silver Bullets from Altsmoke and they truly live up to their reputation. Both made here in the USA and both can be purchased for under $100.
Ordered my 18650 Workhorse this morning.
Although a bit over $100, the Super-T 26650 Simplicity has dropped in price to $149. Pretty sure I'm going to buy one of those as well.