I recently started getting green tea from www.mellowmonk.com. It's certified eco friendly and imported from family farms in Japan. I like that it's not from some big food company. You can also infuse the tea multiple times.
The website also has info about brewing loose-leaf tea. At first I wasn't crazy about paying through PayPal, but I didn't have to set up an account & PayPal is a pretty well known name. The tea comes in the mail in a couple days & they give free shipping with 3 packs or more. The foil packets aren't resealable but I just put it in a mason jar-type jar to keep it airtight.
(I also use jars for small batches of touch-up paint for around the house. I'm a big fan of jars but I guess that's for another list...)
At work, I use an electric kettle to boil water in my office. Sometimes I brew a whole pot, but I also have an infuser that you put over the cup rim instead of a tea ball. So there's no teapot to clean!
Once you make the switch from bags to loose leaf tea, you'll never go back!
Mellow Monk green tea