There is a Wal Mart at 440 N Euclid St, which is right off of Hwy 5, the Santa Ana Freeway. The Target is 12100 Harbor Blvd, right off of Chapman.
Hint: you can find stores by searching Google maps. Go to Google and type in (without the quotes) "Walmart:Anaheim, CA". Then, click on the displayed map. This will give you a map of the Wal Mart stores in and around Anaheim. You can do the same for Target. "Target:Anaheim, CA". Or drugstores and grocery stores. "drugstore:Anaheim, CA" or "grocery stores:Anaheim, CA".