HELP with rat cages please?

No. I have 2 rats (5 rats total in the past) and have done tons of research. Besides the hamster cage having a tank, it is too small. Even most commercial rat cages you see too small, including that one you posted from petco. I am planning to make a rat cage out of a pvc pipe storage shelf, if you are creative you can do this too. It will cost around $60-$80. I'm not sure if you know this yet or not but rats need to be in pairs, so that is why you need such a big space.