Hmm. My high school physics is a little rusty. you did say all ideas welcome; I don't promise these ideas are any good, but they are genuine.

I'm trying to think of a low pressure environment you can get to (without getting on another flight).

A fast elevator?
A scuba training center? (might be able to regulate pressure in a small environment)
Find an FT'er in your town who's going on a mileage run, and will be back in town soon anyway?
Ask camera store where you bought?

One last thing: if you do manage to crack it open, is there sensitive instrumentation that would be affected by the sudden change in pressure?

Good luck