At the minimum, I'd buy the following (Joye 510 fittings):
a couple (at least) decent batteries - Ego / RiVa or better. + charger
a variety of atomizer, LR atomizer, cartomizer. find what suits you well
a few selection of juice, there are many flavours. high nic content 24mg/100+ advisable if coming from a 1 pack/day+ full strength cigs.
I get most stuff from
www.eastmall.net. It comes from China so it'll prob take a whole week to get to you. very good prices.
The above lot comes to $103 with shipping:
Riva starter kit (2x batt, 2x atty, charger) $40
5x LR atty $15
15x (3 types x pack of 5) cartos $13
5x 20ml liquid $20
shipping $15
Brock probably has far better info on US suppliers. e-cigarette-forum.com is great info too.