Looking for fresh Yuzu (fruit, not juice)
I am always on the look-out for yuzu, but I have rarely seen it in the Asian markets. Sooo, my suggestion is to go to San Gabriel Nursery -- a wonderful field trip! -- and buy a yuzu tree! You might not get fruit the first year -- although there might be a few on your new tree -- but it's an investment! Be aware that the yuzu tree thorns are like spikes, so I would plant it well away from children and pets!
had the same issue about a year ago. i've never seen yuzu at markets. so i did what most people do (as Liu has written above), i went to the SG Nursery and bought my own tree haha. it's still budding and i have about 18 fruits on it. only had 7 when i first got it. just a note, it's better to just buy fresh yuzu juice... you seriously need a crate of yuzu to fill a decent sized bottle.