If you can wait ~ 3 weeks on shipping, fasttech.com has several kits, which include (generally speaking) a battery, charger, mod (battery holder + 510 connector), and clearomizer / tank / bcc (depending on chosen kit), all of which will perform far better than the disposables.
EDIT: I'm suggesting FT mainly based on OP's price concerns; you should be able to find full kits on FT in the 15-30$ range. It's not going to be top quality gear - all will be chinese clones - but the price is ~ 1/3 of what you'd pay for similar setups in the states.
For e-liquid, mt. baker vapor has great prices, but see other threads on juices and personal tastes.