SPCR

Any recommendations? I can't actually find any of these that offer a half height expansion slot.

It seems most of the really small cases that don't have a 5.25 drive bay/slim drive bay, also don't have an expansion slot.

I am looking for something more like this, http://www.mini-box.com/M350-univers...-itx-enclosure except with a half height expansion slot.

The half-height slot makes the case so tall that manufacturers include an optical drive. You can skip the optical drive and the omission often allows for a taller (read quieter) cpu cooler.
Cases would llok like the Yoeng Yang, Joujye or In Win.
To recoomend a case it would be helpful to know if you plan to use the half-height slot for a graphics card like the 7750 low-profile, which requires some more power, or just any other add in card with low power requirements.