My favourite olive oil for the past few years has been the Monte Pollino oil that Trader Joe's sold. Sadly, the last few months that we've been to TJ's to get more olive oil, they have not had any. It seems like, in classic TJ's fashion, they've discontinued it... I will keep my fingers crossed (and maybe talk to a store manager) in the hope that the stock it again.
Antonello Imports have it for $15 a bottle (compared to $5 when TJ's had it...)
This blog post on Chowhound mentions that it seems Monte Pollino at TJ's was the same as a more expensive brand, Frantoia (which I've not seen generally in Washington - maybe DeLaurenti in Pike Place has it?)