I just moved mine into a tub over the past couple of days.

Step 1: Went to Wal-Mart and bought a 32 quart tub. (Bigger than needed, but the other sizes were much to small that they had in stock)

Step 2: Bought a roll of duct tape and some bungee cords (At Wally world as well). Make sure the cords will wrap around the tub. I also got a roll of double stick tape.

Step 3: Went to a couple of restaurants and picked up a bunch of newspaper for bedding (free).

Step 4: Went home and heated an awl in the flame of the stove and started poking holes in the top and sides of the tub. I figured I'd rather make to many and cover some up with some tape than have to keep going back to punch them. Just don't overdue it.

Step 5: Removed the UTH from the tank and transfered it to the bottom of the tub. I tried it without any additional bonding, but it heated up and fell off so I added duct tape to it. Just around the edges to secure it. Took four flat caps from water bottles and secured them to the bottom using duct tape. This gives some space between the bottom of the tub and whatever it is sitting on for circulation.

Step 6: Put everything but the snake in the tub. Newpaper, hides, water, moss, wood chunk, thermometer, hydrometer and then plugged everything in and let it sit for about 2 hours waiting to see what the heat and the humidity did.

Step 7: Poked some more holes in it to let some of the humidity escape. Waited and watched. Added more holes. Rinse wash repeat. Taped some holes up. Finally got it all where it needed to be. I then got four flat caps from water bottles as spacers

Step 8: Crumpled up a bunch of newspaper and put it in the tub leaving just one open area in the middle so I can see the gauges in the back.

Step 9: Introduced the snake into the tub and watched him to make sure there was no problem. So far, so good with the exception of the humidity being a bit high but removing the moss seems to be helping that out.

Tips:
1) Make sure you get a tub with a lid that latches.
2) It's easier to tape over holes than to have to remove everything to burn them in.
3) When you remove your UTH from the old tank either use a blowdryer or make sure it is still warm as it comes off much easier.
4) I prefer a flat, long tub (no matter how many quarts it is) not a small deep one, but you can probably work with either. The deeper ones are more display like if they are clear plastic.

Cost of project:
Tub: 4.99
Tape: 5.99
Double sided tape (I never used): 2.79
Gauges: 10.49
Newspaper: Free
Hides: Free (one from the tank he was in and one an old plastic container I cut up)
Heaters: Free (already had the UTH on the tank)

Total: $24.26 including tax