I'm pretty sure that Brett and his dad both posted back awhile ago about using laces from Triple-C Leather. They are called "cougar tan" and look great on older gloves. Brett also posted something about ordering the laces in a specific "weight" (thickness) and I'm sure he'll chime in to give us the lowdown.
The catalog I got from Triple-C said that the minimum order was 100 laces, and they were about a buck apiece in that quantity. Others have told me that they have purchased smaller quantities than that, but I have not contacted the company to get any details.
Spinning further and further off-topic...
I posted some pictures of my Rawlings John Pesky glove last summer- you can see it in this thread:
Rawlings G490