Hello Chiffers, 
I was trying not to buy anymore whistles for a while, but may consider one of Michael Burkes Composites if you have one you would like to sell.
I would like to find a Low F especially, but may be swayed to another key if you are asking an attractive price for it.
So, if you would please, let me know if you have one you would like to sell, other than an EZ model, which are fine, but I have no problems with reach.
I tend to prefer the older, non-o-ring models for the simpler construction and lighter weight (and older prices 
). But let me know what you have and how much you would like.
I forgot to add, please Email or PM me for replies.
Thank You! Happy New Year! 