http://theprimalprofessional.com/ is probably your best best. Expensive but very well made.

another option if you’re not willing to wait until May for a pair of Primal’s

I have a pair of the VivoBarefoot Ra II.  I’m in more of a business/casual environment, so you’ll have to make the call if they’re appropriate for your dress code.

+1 vivobarefoot

I emailed the team about it a while back and was told that they were preparing to make a video (probably MWod Pro) about it. So we’ll keep our eyes out there. I’m interested in this as well.

Vivobarefoot makes several. The Lisbon is pretty pricey like the primal professional but is a little less bulky and has a wider toe box. Also check out lems shoes http://www.lemsshoes.com

Ben Sherman also makes some shoes that are very close to zero drop. I have a pair of these Mayfair Oxfords (in black) and they’re the first pair of dress shoes I’ve owned that let my feet move like, well, feet (vs. the usual “strapped to two 2x4s” feeling of such footwear).