Seymour Lumber Co Ltd

The owner is a really interesting guy. He knows a ton about stonework, and he gives a great price. You usually have to plan on spending a bit of time there though because he is usually quite busy. The place caters more to contractors, so you'll have more luck if you go on a weekend when he has more time for homeowners. Also, plan on a few trips, because the store can be closed at odd times.