If you're like me then sea urchin is one of the Best Things. Creamy goodness from the sea with a certain durian/chocolate-like psychotropic element on top causing addictive tendencies. Hard to find very fresh (which is how it must be), and expensive to boot at sushi restaurants.
Here's my "secret" source....Sung Fish co. (1795 Pandora St. ) ( for the next few months it is in season.)
If you don't mind buying 10 lb or so you can buy it whole and live on the days they are cracking (around $2.50/lb), but it's a bit of a toss-up how much and what condition the uni inside the shell will be, and how much will be water. And cleaning it is a real mess.
Or you can get it cleaned and sorted in trays (around $30 for a large tray of B grade, which is what I usually get).
Or if you *really* like uni you can get a 1 kg+ box of seconds (basically all the broken or discolored bits they can't put into trays, piled into a small cardboard box) for $30 which will make all the uni cones or nigiri pieces you and your uni-loving friends could ever desire..(don't even think about eating it all yourself..it's way too much even over a few days). You need to talk to Mrs. Park @ (604) 255 4718 and she will tell you when you can come by.