I am currently making a humid hide for my bp. It is a Tupperware container (obviously big enough to hold your bp) with a lid ($2.99 at Stop & Shop), cut a hole in it big enough for him to fit inside (free), use a lighter to smooth out the cut edges (free), throw some of his bedding on the bottom (I already have bedding so free), and T-Rex coconut bark (soaked in water, about $8.99 for a huge bag) put in the back and sides of the hide. Viola, $12.00 humid hide.
As far as the UTH, I hope you have something to monitor the temps because they get VERY hot...I use a dimmer and a temp gun...
I use a black light on top to keep up ambient temps, along with the UTH (connected to a dimmer!) it keeps the tank at good temps.
Here's my setup for my one and only tank....the rest are in tubs..
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