Got a soldering iron and some solder (a $25.00 investment)????
I'm not cheap, but I'm broke so ....same diff! I just build these since I have electronics stuff anyway.
Variable Volt Box Mod Kit
If you're kinda handy...build one from a kit. I've been using mine for about a year now. Not flashy. Fits in shirt pocket well though. You'll also need swappable batteries (14500's ) and an external charger. But I'm NEVER without power since I have 3 sets of battery pairs in rotation.
Soldering iron...multi-use, own for life.
Battery charger...multi-use for many mods
Batteries...use and replace item (Consumable...last a long time though)
Box mod kit...get two if you can, they are cheap and you have spare parts....or at least get the $7.99 spare guts kit so you're not stuck waiting for the mailman if something breaks.
You'll need some epoxy too. Stay away from hot glue, IMO. Look up JBWeld or other epoxy.
Now, if it breaks, you can replace individual parts for a few bucks each. Will work for requirements up to 3 amps.
They are out of stock ATM
$17.99
Yes you can get an eGo for 20 or 25 each....but you need TWO because you have to charge them (batteries don't swap). Also if the box mod reg fails, it's cheap to replace/resolder. Also, I like the box form factor better than a tube...shirt pocket friendly.
The whole guts of the thing can be replaced for $7.99 (
http://www.madvapes.com/variable-voltage-regulator-board-kit-rev-4.html)
And just the regulator for $2.49 (
http://www.madvapes.com/d2pak-ldo-5-volt-30-amp-regulator-with-control-pin.html)
Depends on how you want to roll. To me, I'd much rather lose/trash/drop/fix an $18.00 e-cig that works great than $200.00 model that goes byebye one day (lost, stolen, breaks, etc). To each their own.
If you're not handy or don't want to get into that...just get a couple of eGo twists. No external charger needed.