I haven't had the loose stuff from a bombilla Argentina/Uruguay style, but they had yerba mate tea bags at a continental breakfast when we were in Buenos Aires. I had a few cups of yerba mate from the tea bags (cruz verde brand??). Not bad, but just tastes like green tea to me (which I like). I believe they sell them here in the states at Walmart and the like (at least at mine which has a very large hispanic - though not likely South American - patronage).
Retired in 2013 at age 33. Keeping busy reading, blogging, relaxing, gaming, and enjoying the outdoors with my wife and 3 kids (4, 10, and 11).