Eros.com is still the best IMHO

finding other options

you might want to check out this other recent thread on BP ads: https://www.theeroticreview.com/discussion-boards/transsexual-19/bp-listings-going-all-strange-121911?page=1

or to cut to the chase, here is a reply i made on that thread:
"Best way to find those other sites is to open private window (or "incognito window" in some browsers) and type "[your city] transsexual escorts". by and large, some reputable ad sites will show up in top 10 results.  
cross check here on TER any that you're interested in "  

good luck!  
xoxo
kacy