I live and work in Coppell.
Remember some parts of Irving and a small part of Lewisville fall into Coppell ISD. Also a small part of Coppell is in Lewisville and Carrollton Farmers Branch ISD.
When do you need to move.
If you are still looking to rent a 3 bedroom house in Coppell High School boundary, I can definitely help you. I have lived in Coppell for the past 18 years, own several rental properties in Coppell and also have complete access to MLS listings in Copppell. You can call me at (214) 695-8148.
If you could supply a little more information, we'd could help you.
This link may be what you're looking for http://bit.ly/OPzEym