We got a great price on a floor model Fridgiaire Professional series built in microwave and the matching wall oven that we put underneath. You will need to make sure you purchase the trim kit.
I encourage you to go to your locally owned applicance store and see if they have any deals or specials. We got all of our appliance for our new build that way, and 4 years later we don't regret it at all!

If you have an Ikea store nearyby, they might have what you are looking for. Also has 5 year full warranty.