Oh man, great question; one I've been putting off thinking seriously about. Lets see:
Blu - 2 starter kits, 4 extra attys and two extra packs of carts................. total about $125
VaporKing - 1 starter kit, 2 extra batts, wow & cool cart blank samplers, 3-5 flavored cart packs, usb charger (they threw in a free pass-through!) .................. about $200
Smokestik - Hendu starter kit, a Royale, (a gold and a pink batt on the way), 4 packs of carts (w/ more on the way) and I want a "pitbull" when it comes out .................about another $200. At least.
LOTS and LOTS of liquid from many of the places I read about on here. All together I must have a hundred samples of different liquids. And just a little while ago I ordered $25 worth of Volcano carts of various flavors. So probably a total for ejuice would be $150-250 with all the orders and shipping.
But I think I'm close to done for awhile. I love vaping, I have only tried a handful of flavors so far but I think I have everything I need.