Liad,
Try this link to Matthew Parker
http://www.matthewparkertrumpets.com/record.htm
There is a small collection of examples.
If you're so inclined you could probably make a very simple example yourself..Mike laird had some very simple holeless ones rigged in C using old Bb bells for his students to use. They worked fine and really gave the right 'feel'. I'm not that dextrous and probably have too much money so I'll probably look at either a Steve Keavey or Matthew Parker 4 hole.
Why those? Well I think they're quite reasonably priced providing you keep it simple (these things can get really tarted up using siklver garlands etc etc)..if I remember about $1500 but stand to be corrected. They are also used by some very good players.
Regards,
Trevor