3 bucks is pretty standard for live rats. And congrats on the switch.

Be careful with the live feedings though. A half-subdued rat bit my bp during constriction about a month or so ago. I successfully intervened before any damage was done, but the rat bit me instead. Drew blood too. Rats pack way more a punch (or bite) than mice do, and all it takes is for the snake to not grab it right, which can happen very easily.

F/t rats are usually about 2 bucks a piece. Just extra motivation to switch once her get her used to rats. I would keep doing what you are doing now for a little while before changing anything again, then switch when you think your bp is comfortable with rats.