Similar to @anthonyfranco's approach - I've had success separating the design creation from the HTML / CSS creation in the past.
For example, i've used http://99designs.com/ as well as working directly with a designer. You should have much more luck finding a slicer on oDesk or there are also many sites dedicated to slicing PSDs.
I've found that it is much easier to find a good designer that doesn't know HTML / CSS and let them focus on the design alone.
One other thing to bear in mind is you need to guide any slicers so you end up with HTML / CSS that is easy to modify going forward. Beware of fixed pixel layouts, possibly look to have the slicer use your framework of choice (Bootstrap, Foundation, etc), and if responsive is a consideration, the slicer may be able to handle that as well if you find a good one.