I don't care about the money part of it to me its the fun of doing it and learning as I build it the cage alone will only be 65.00 or so to build. I order acrylic in 4x8 sheets so its not going to be very much. I all ready have most of the blue acrylic. The room the room the BP will be in is at 65 all year long so I rather have a heater that will keep up with the cold. I was thinking about doing 2 40 heaters. So are you thinking a area sunk with bark for her to dig in along with a cave or something using heat tape to keep it warm?