daytime buses to Oaxaca

I don't have high hopes of getting a response on this rarely visited site, but here goes anyway. Am going to be in Oaxaca in November, and would love to visit Juchitan (never conquered by Aztecs, matriarchal, loves gays!) but Lonely Planet says most buses leaving J Town leave at night. Are there any buses headed to Oaxaca in the daytime? Could I find such a bus in Tehuantepec or Selena Cruz? Thanks.