$2.50 a month for misc costs........
Start out with 1 male and two females (cost me $3), go to walmart or whatever and get a rubbermaid snaptight 15qt for $4 and a water bottle for $1.87. Food is about $5 for a 2-3 month supply. I have over 20 healthy mice in my little colony now. I just upgraded to a 30 qt container (gen pop) for $7 and the ones in the picture are for pregnant females and their babies. Breeding your own is just too easy and cheap NOT to do, especially if your snake requires a certain size mouse like my little king did.