As much as I hate to send you up the road toward Phoenix, the homes are probably cheaper in Casa Grande.
That said, I don't suggest you purchase a home on the cheapness factor. Even if Oro Valley costs more, and it does, the resale is much better, the city has a lot to offer and the views are outstanding! The proximity to Tucson adds some great entertainment possibilities, medical services and just all around city atmosphere without being a big city. I've lived in Oro Valley for over 20 years. It's a great little city with a lot to offer!
I did see your post yesterday. If I remember correctly, you were planning on renting first? If you know the area you want to live in, renting might not be your best option. Housing prices are starting to rise. That's a good time to make an investment!
I linked last month's housing statistics at the bottom of this response.
Best of luck!
The town of Maricopa which is between Casa Grande and Phoenix or Laveen. Check out my website and you can see all Homes and List prices.
Please let me know if you require additional information.
Have a GREAT day!
Vivien L Biggs PLC
Prudential Arizona Properties
Check MLS for homes on my website