Congrats! Some rescues might be hesitant with dogs, but with it being kitten season, you should have no problem finding a cat. I am overjoyed with the fact that you chose a older cat, because kittens are always the first to get chosen. The older ones suffer.
Please try the website www.petfinder.com. It has many cats looking for homes. And you can enter what you want and your area. GOOD LUCK!