I am planning to buy a good air pot, such as a Zojirushi

http://www.zojirushi.com/ourproducts/airpots/airpots.html

for making 6-8 cups of tea for the office.

My plan is to make it right in the air pot. Since none of them come
with an infuser, I'll need to find one that can handle roughly 3g of
leaves for each cup (8 oz). For an 8-cup (48 oz) air pot, that would
be 24 g of tea.

Any suggestions for the infuser?

There are several on this page that look promising

http://www.teagschwendner.com/US/en/publish/Shop_Permanent_Filters.aspx?ActiveID...

including the 003132, D-93998, and 003120.

I wonder how a cloth tea net would work:

http://www.teagschwendner.com/US/en/publish/Shop_Cloth_Filters.aspx?ActiveID=1123&parent_id...

This eBay vendor has a large selection of stainless steel ball
infusers.

http://search.stores.ebay.com/acme-kitchen-plus_tea-ball_W0QQfcdZ2QQfciZQ2d1QQfc...

This one got great reviews on Amazon, but it doesn't say the
dimensions

http://www.amazon.com/Teeli-Brew-Basket-Finum-Strainer/dp/B000J3JFJU

Any other suggestions?