I mostly drink yanchas/Wuyi rock oolongs. Get them from various sources, no specific brand. Also occasionally reputable sheng pu-erh if I can afford some, non-pu fermented teas, jin jun mei, genmaicha, or anything Nepalese or Malawi whole-ish leaf, in small quantities (max 50g).

I try to buy local loose leaf.

If you are looking for a grocery store recommendations, I love Celestial Seasonings herbal teas. They have an amazing peppermint tea.