I do have a Tandy leather store in my town, just a few minutes away from my home. This is a huge store that seems to stock just about every item in the Tandy catalog.
While I can easily find most any leather cleaner, conditioner or leather working tools there, my visits have been disappointing in regards to finding good laces suitable for most glove restorations.
A fellow glover on this board and I recently exchanged a few samples of laces through the mail and he sent me some Tandy laces that might work well for some of the older gloves I have. But they don't really seem to carry anything suitable for high-quality modern gloves.
If anyone out there has catalog numbers for any Tandy laces that work well for them it would be of interest to me.
I have heard nothing but good reports about Triple-C leather, but have not personally done any business with them.
I do relace quite a few "playing" gloves for folks in my area, which is a hot-bed for recreational baseball and softball. After searching the internet and comparing prices, I made several bulk purchases through Tanners. Their laces are high-quality and suitable for use on Rawlings HOH gloves. In fact, being that Tanners is the officially licensed dealer for Rawlings accesories, these laces may very well be the same ones used on Rawlings gloves from the factory.
These laces seem to be of an even better quality than the single, plastic-wrapped Rawlings laces that can be bought in many sporting goods stores that carry the "HOH" name on the package. And they will cost you about half as much, even being 72" long versus the 48" length of the packaged singles.
A link to their website is at the end of this post. They do not have an internet ordering system and you will need to deal with them via email or over the phone for pricing information and placing orders. While they prefer to sell laces in bulk lots, they are open to filling smaller orders. Their service reps are quite helpful with handling special requests.
In bulk lots of 25, their 3/16" wide (these actually measure a bit over 3/16") in 72" lengths and basic colors (tan, dark brown and black) will run you just less than $1.50 each with the shipping. Other colors (red, blue, white) will cost a little bit more.
http://www.tanners.com