Hi! I haven't found anything really close to Cheez-its or goldfish, I have stiil found some pretty great cheddar snacks!
Crunchmaster's multi grain white cheddar crackers and their kids cheezy crisps are both really good!
Foodshouldtastegood's Cheddar crackers/chips are DELICIOUS.
I haven't tried these yet, but Glutino makes a cheddar cracker that looks like a ritz. I've tried the original and they were really good so I bet the cheddar would be good too!
Blue Diamond makes a cheddar flavor of their Nut-thins that's pretty good.
Hope this helps a little!