101Vape.com had them for $40, but not sure if they still do...
I still use my MVP daily, and yes, it will work with any eGo threaded tanks or 510 threaded tanks.
They contain a 2600mAh battery, and are charged via micro-usb, just like most cell-phones. Fully charge from "empty" takes about 4-5 hours, but you can also use it while charging (pass-through). It will handle coils down to 0.8 Ohms, and variable-voltage is 3-6V in 0.1V increments... Power is adjustable from 5-11W in 0.5W increments. There is even an Ohm meter and puff-counter!
I prefer my MVP over eGo-style for these main points:
Stands up on the desk
Higher mAh rating than an eGo-style
VW setting in addition to VV
No special charger needed (charges with my cell-phone cable)
Fits well in my hand
Button is stiff, which prevents accidental firing
They're not as portable as a stick-shaped eGo, and they are heavier (not by much), but they are durable and reliable devices!