Thank you, Earthworm. I may be contacting him soon. I've looked all over, even looked for bird dewormers that have levamisole. I may contact the local veterinary university tomorrow and see what comes of that but I'm wary because I hate to take both boys on a 25 minute car ride to the vet (one way). Also, I'm still recovering from a rather expensive cat vet bill. Sigh. I'm at my wits end. I can't tell if the boys won't eat a lot because they aren't hungry or they just hate the taste of the medication.
Thanks again for all your help. You're a peach. :)