Here's three to start with;
www.barkertownsutlers.com
www.jastown.com
www.gggodwin.com
And last but certainly not least is the Forums own Matt Newsome at the Tartans Museum. All dealers of good repute. However, as far as I know, only Missy Clarke at Barkertown or Matt Newsome would be able to sew you up a kilt.