Thanks for the info everyone

.
I did some reading as well and from what I've read its most commonly found in poultry and commercial/ raw cat and dog food. I wasn't able to find anything linking that particular 'type' to reptiles.
I'm thinking the most likely sources were either the frozen chicks for the lizard, the formula (hope not), or the cat's food. The cats don't seem sick at all though... I'd wager a guess that it came from the chicks.
We didn't eat eggs, chicken, beef etc. at all the week before and were house-ridden for 3 days before he got sick as my older son had the flu. Whatever the source is, it definately came from inside the house.
The IDC said they don't do testing, but is reporting the incident to the FDA so they can look into the formula and make sure its not contaminated. I'm going to see if the Agriculture College in the area can test the chicks. May seem like I'm over-analyzing everything, but it would make me feel better to know where it came from

.
I'm definately learning alot about salmonella lol! All I knew before was that you could get it from meat/ reptiles and to wash your hands and cook meat good.