My last attempt (about a month ago) to process 135 E-6 through Walmart was ok, other than the wait. Mine were mounted, as requested. I don't know what if they would sleeve 135 per request or not.
I haven't tried anything other than 120 C-41 and 135 E-6. However, based on feedback here and elsewhere (photo.net and maybe one other) with people that have used the services, it seems that the only consistent trouble is around 135 C-41 processing. Which is still sad.

