Another simple solution will be to use PVC and make a light bar and stand. It will be only a few bucks but look horrid as any PVC frame will. I quickly put this together to show my idea.

materials:
1 bolt -- 2.5" 1/4-40 used
1 hex-nut
1 locking nut
1 clamp light
6 90 degree elbows
1 pipe 1/2" diameter PVC

All told, without the light, this is between $2 and $3 for the stand.

Drill a 1/4" hole through one PVC pipe where you would like the lamp. Thread the hex-nut onto the bolt, put the bolt through the drilled hole, and tighten the lock nut on the bolt. Attach the clamp light to the bolt head just as it was attached to the clamp.

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~ Mark

Here's another tip. Attach a metal or plastic bar (longer than the terrarium height) to the reptarium structure (in the corner), bend the top part down so that you end up with something similar to a cane and then you can clamp it there safely.
If you do it right, it will be secure enough to move with the reptarium.

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Wish list: Blue Tongue Skinks and Uruplatus =)