here is one sight
http://www.kintail.co.uk/shoes.htm

another below
SHOES ( GHILLIE BROGUES ) -
Ghillie Brogues are Highland shoes that lace up and around the calf. They are made from top grade leather and are available in black for evening and brown for day wear, $145.00 pair. Please specify shoe size when ordering, or send us a tracing of your foot.
about 5/8 the way down on the following page
http://kiltrental.com/accessories.htm



are offered here
http://www.highlandclans.co.uk/Ghillie_Shoes.html

I am sure there are more places but those are a few I Found