Wads are usually available from the normal internet sellers, Powder Valley, Grafs, etc.
Shot is probably better to buy local due to shipping cost, it's heavy as you well know. (Too bad you're not in my area, I have about 1K pounds of shot, #8's & 9's.)
Hulls are sold on GB or on this 'For Sale' forum, or at your local shotgun/clays range.
You will save tons by loading your own 410's!