There are a few mods in the under 75 dollar price range but they are going to come close,
The cheapest (non DIY) is a madvapes box mod some batteries and a charger
The mod 20 bucks
2xAA Box Mod with slow change LED and green horn switch (they have different color switches)
The batts 5 bucks
Ultrafire Protected 14500 Battery, 900 mAH (you can get these cheaper but for shipping purposes it may be just as well to get them at madvapes)
the charger 8 bucks
AG-126 Lithium Ion Battery Charger (they also ahve a single battery 5 dollar charger that works fine as well especially for 14500 sized batts...of course you can get much better and more expensive chargers...but these do work fine for me)
roughly 33 bucks...a bit more if you get nicer aw imr 14500's
There is also the madvapes roughstack for 45 bucks probably looking at another 15 for batteries and charger so 60 bucks
RoughStack
The copper as a full kit is in your price range at 74.99 for everything
Copper E-Cig | AtmosUSA Ecigs
(no picture available)
The massive bombshell mod is in your price range for an 18650 mod at 59 dollars...you just have to search around for a cheap charger and some 18650 batteries.
www.hotvapes.com
Someone above mentioned the big kazoo if you think you want 5v
you might want to check out
Best e-Cig Mod List | e-Cig Mods Database they have a search feature by price range.