>>5069582 (OP)
I would say so. I usually get the bogo Oxbow rat food and that will last 4 rats awhile. You'll definitely want to get your new pet a companion so they don't get lonely. I suggest 2-3 girls since I've had better experience in friendliness than boys.
A single unit Critter Nation works well and starting their enclosure is a big chunk of the money to face. I have fed mine fresh fruits and vegetables on the daily and if you get things like baby carrots they're dirt cheap. Make sure to get a water bottle, food bowls, bedding, and throw in a couple hides/toys and that's the setup