There are some really good USA made battery units that come as a kit! (atts,
batteries and chargers come from China, as do you cell phones, etc.). Bonus is that you'll only swap out a battery maybe once a day with a battery unit (depending on what you get).
The SP2 (Spark Plug) comes with everything you need including atty and liquid, cartridges, batteries and charger. Good price ($74.95) and is incredibly small and light weight with a bottom mechanical button on it. (I'd pick up a few extra attys).
Here is a link:
SP2
Plus they have everything on the site available with a coupon code for $5 off a first order (code FIRSTTIME at check out) or coupon 5OFF for 5% off your total order.
EDIT: Forgot to say, I just picked up mine yesterday and LOVE it.