I like Starbucks Sumatra blend

I don't know any off the top of my head, since most of my food shopping is done pretty low-brow...

But I'd like to know.

Harney & Sons has some loose leaf, but not as easy to find as their bags.

I haven't purchased loose leaf in years but I remember twinnings usually has some in grocery stores. I'm a Bigelow gal myself and it's hard to find loose leaf Bigelow anywhere.

You could also look at small bodega type stores. I know we have a local Muslim shop that has a boatload of loose leaf teas.