Buy individually packaged chocolates (and as eKatherine said as high a cocoa solids as you can stand, though personally after about 65%/70% I find them inedible, but it can depend on the bean). Yes good chocolate is expensive. you tend to not need as much IME.
I freeze mine then shatter them in the package with a hard smack on the edge of the counter top. Then when I open them each small piece is allowed to melt across my tongue individually (and being frozen makes them take longer to melt) then washed away with a glass of something tart to clear the palette ready for the next piece. Make an indulgence of it. Enjoy every single piece to it's fullest.
Also you might want to consider buying chocolate scented shower/bath products. I've not tried it personally but I know people who swear that a long chocolate scented bath or shower takes their craving away. Personally I think it would make me want to binge all the more. But that said I have a cinnamon shower-gel that I only use occasionally for a treat (it was both expensive and a limited time) and it hasn't yet sent me racing for Cinnabon or the like.
42" jeans(25/01/2013) 40"(28/02/2013) 38"(20/03/2013) 36"(25/05/2013)
Down from 60" waist jeans since June 21st 2012.
Still keeping to my 26" jeans, but they are too tight for comfort. too many tasty things in the US, and over Xmas.
Onwards and Downwards! http://www.menu52.com/