Classic best price point for a starter kit is Liberty Flights, their Riva Lite 510 bundle. It has two 750 mAh batteries, charger, couple of atomizers, empty cartridges, costs $30 after the 20% off october20 discount code. Their shipping is cheap, pretty solid customer service.
I always recommend also picking up a pack or two of 2 ohm Boge 510 cartomizers -- I'm a cartomizer user, they provide good wamth/vapor without stressing the batteries like the really low resistance cartos.
The batteries run a long time between recharges (compared to Volt, which is absolutely a solid choice, a new generation KR808D-1).
Add a bottle or two of eliquid.
Total, about $50 - $60 including the cartomizers and eliquid.
The Riva is a fat battery 510, manual, with a little push button on the side to fire it. If you need/want a more cigarette shape, or an automatic (operates by you inhaling), then the Volt has a lot of fans, or other KR808D-1 kits are good. Check the Pay-It-Forward Deals and Steals thread to see who is running specials (I have a link to PIF in my signature).