Emu XL-7 & MP-7 User's Group

Okay, I'm currently working on a project 
(http://www.strangeinterludes.com), and I'm needing a few 
sound effects.  I've found most of what I need out in the public 
domain, but I'm missing a few:

Hospital ambience
Crowd at Election Rally
Electronic Cash Register beeps and receipt printing

If anyone out there can help me out with a download or link or 
something else, that'd be great.  Not sure what I could trade, but 
I'm sure I could find something.  Thanks!

Clay