For my big guys I use the fountain soda boxes I get for free at work. You could get these for free at any restaurant/bar. They even have a pre cut hole and everything!
Its not very pretty or anything but its free and has great function for a hide.
My name is Adriane Welcome to the Jungle
1.0 Husband
0.1 Banana Pied Ball Python
2.0 Boston Terriers
0.2 Buggs