www.adagio.com has a large version of their IngenuiTea tea pot that will brew a whole pitcher of tea, then dispense it into your pitcher of ice, filtering the leaves as it does. Bill and I have the small ones that brew a 16-oz. mug worth of tea, we love them.
Any good linen supply should have the cases for storing and packing china.
How fancy are you looking for as far as tea infusers go? Wal-Mart has an iced-tea maker kind of like a coffee maker. Or, you could do what my old roommate did—just use a coffee maker. Put the tea bags in the thingie where the filters go, dump in the water, brew. Works like a charm.