I'll make one this weekend, but it's really pretty simple. you will need...
1 appropriate sized tote
1 zoomed heat pad
1 temp gun
some paper towel
a water bowl
some duct tape
a dimmer switch and drop cord
and a drill.
you drill some holes for air in the sides of the tote, not too many and not too high up or they'll let out all the humidity. Stick the heat pad to the bottom of one end of the tote. splice the dimmer switch into the drop cord (I'll post pics of how this is done later), plug the heat pad into the dimmer switch/drop cord. put some paper towel down in the bottom of the tote, set your water dish in there, adjust the dimmer and check the temp on the hot spot with your temp gun til it stays stable right around 90 degrees.
perfect ball python enclosure.