cheapest solution is flexwatt, a $12 pyrometer from Harbor Freight, an extension cord with built in dimmer swtich from Lowes or home depot $13, and a tub of your choosing...

I can setup a tub to house an adult boa for roughly $100.

$25 for a Xmas tree box from Walmart
$13 for extension cord/dimmer switch
$12 for pyrometer
$26 shipped for 4' of 4" 6w flexwatt from the beanfarm in assembled and ready to go form.

$2 water dish

If you want a hide...Grocery store give away boxes all the time for free.

This hobby does not have to be expensive.