We would first recommend your local gaming store. It’s a great place to meet other players and support the local community. It’s also your best bet for finding Organized Play events. Also, some local Wal-Marts, Targets, and Walgreens stock Dice Masters Products

If there is nothing local, or they do not have what you are looking for here are a few online retailers:

Sandy Game Haven: http://Sandygamehaven.crystalcommerce.com

Cool Stuff Inc: http://coolstuffinc.com

Troll and Toad: http://trollandtoad.com

Arrow Star Games: http://arrowstargames.com

Amazon: Amazon.com

eBay: http://ebay.com

These are also great places to find the going rates if you are looking to value your collection.

Dice Towers:

Etsy: https://www.etsy.com/market/dice_tower

You may also get custom mats printed here:

Inked Gaming: http://www.inkedgaming.com/