when we had some bp's that we had not switched over to rats we did purchase mice from petco I thought on a whole they were a decent deal. For one snake It really shouldn't be any problem and they sell feeder rats as well. Though if you can find a feed or farmers supply store that sells feeders you may get a better deal.On the other hand I find the comment about f/t being more economical when you have more snakes to be a little false hood it's convient if you don't have space to raise your snakes food supply but that would be it. Feeding 40 + snakes at any given time I frimly believe that live is the way to go as thawing out that many prey items would just be way to time consuming as well as having to deal with refusal's and refreezing and such.Personally I am a frim believer in rats or asf's being a better or more practial food source for bp's.