Barbara, you can search through my website that accessing the Multiple Listing at www.SouthOCHomeInfo.listingbook.com.
It is possible in an older part of Aliso Viejo you can get a single level but the complex are attached condos. As far as single family homes in that price point, you will not be able to find something in a safe neighborhood. Both myself and my parter have over 25 years in local law enforcement with 10 years in real estate.
If I can help please give us a call 949-547-2255.