My 20 just loves those Wall mart Federal 100 round bricks. Quality ammo for cheap, much better than the Remingron and Winchester cheapies.
Ammo is kinda expensive to ship, weighing as much as it does. (I'm talking shotgun ammo here, not centerfire). Often the shipping cost is not worth buying by mail.
Check with the local T & S club, often you can find bargains on case lots of ammo. Some clubs make bulk purchases or groups of shooters will make a bulk purchase to cut costs.
There are suppliers who cater to the clay target crowd, if you ask around you might find one in your area.
I have always found Gamaliel to be reliable if you must order through the mail.
I am no longer a member of this forum. Bye!