Bus north on hwy 200

I looked into going there also. Was told Primera Plus bus line, leaving nightly from Zihua @ 1600 & 2030. 10 hr trip, $571, told two stops but they didn't mention a bus change. Then yesterday saw a blue bus called 'Autobuses Touristicos', with a sailfish logo. Took a quick photo but wasn't able to zoom in enough for a phone number.