Go to Phoenix Craigslist.org and in the search box type in Rocky Point and then from the drop down menu click on housing then when you reach housing you can use the drop down menu again for rentals. You will always find tons of options there. Or if you don't want to burden yourself, you can go directly to www.seasidemexico.com and choose a condo from the largest property management company in Rocky Point (I am not affiliated with the company.)
Unfortunately Seaside has spammed Craigslist to hell with all their listings. Makes trying to rent direct from owners more of a chore. I used to rent through Seaside but all of the add on fees has become redicules. I feel like I was renting through Safe Marine.
I understand the ill feelings towards Seaside given the history of the owner buying the previous blog site and it's true there is some of their spam but I haven't found it to get in the way of finding condos direct from their owners. As I said, there are ton's of listings. You just half to separate the "wheat from the chaff."
I understand that FMI is a much better company to rent from than the big two (Seaside and Oceano) Less inventory but less hidden costs and nicer people. They have condos and houses. I used to prefer rentng houses to condos.