I suppose it depends if you want it all to be bondage-y or just want the look. Like if you add a bit of latex and rubber you look pretty bonadage-y, and if you add that to some stuff you already have it would be pretty cheap. EG a latex skirt with a black bra you already have, or a leather corset with a black skirt you already have. But then if you want to go the whole hog it might cost a fortune.
Personally I recommend What Katie Did corsets as they are properly steel boned. They also have a leather one on their website, but black satin from LH would work as well depending on the rest of the outfit.
It's the accessories that make it and they are fairly cheap. If you think of your profile pic, any black bustier would work with the gauntlet gloves and I'm presuming a whip.
Or you could go down the latex route. LH have some nice stuff but I would also recomemnd this ebay seller, I am so chuffed with the latex dress I got. http://shop.ebay.co.uk/merchant/latex-design_W0QQ_nkwZQQ_armrsZ1QQ_fromZQQ_mdoZ