Besides the AA Lites AR10 mentioned, the Federal equivalent is a good load.
Any International trap load with its roughly 7/8 oz load qualifies, but they do not run cheap.
Best thing would be to reload your own. It's easy, and you may actually save some money. A 1 oz 3 dram load kicks little, and you get 400 of those in a 25 lb bag of shot...
I bought a used 600 MEC, a bottomline loader, for $50. The payback period was about 4 weeks....