depends how you define fun...
mine isnt too keen on being gotten out but it completly fine once out
at the moment shes on pinkies (every five days) and mine hasnt really got a name yet, cant think of one that would suit her :lol:
Then when its about a year old you'd need to get a proper viv for it - one about 36 inches long and 18 inches wide.
So to start with you can get all you need (not including the snake) for under £50. It'll need a couple of pinkies a week, and as it grows bigger you give it larger mice - fluffs, hoppers, etc, up to adult mice when the snake is 3 or 4ft long. It'll cost £1 per week to feed maximum.