Hi Lynda!
I found one that is meant to be wall mounted but could possibly be undercabinet mounted, by Mundial. It's a
pro knife rack for commercial kitchens.
Could you possibly use a magnetic strip mounted undercabinet, and just stick the knives to it?
I found a
clear acrylic and white one
and a wood one by Wustoff that swings out from under the cabinet
Wusthof knife block
You could cover this one with FXSheeting I suppose!
And a
Ginsu one that comes with knifes, but for $35 you could throw the knives away.
And a supercool one at ChefDepot.com, unfortunately not made for undercabinet mounting but...