James L.
Yelp
It's got a great selection of local, organic and various craft products. Growing slowly over the years, some notable recurring vendors include the crepe van, Saltspring Island Cheese, Richmond Mushrooms, Wenger Sheep Farms, the vegan pate lady, and Earnest Ice Cream.
When I want to get higher-end items, I end up going here more often than Granville Island. For large potential deals on farm-raised beef, chicken, duck, and lamb, you can't really go wrong here, because the farmers are always eager to talk and you can build up relations with some. A familiar face helps you to decide what cuts and if you are buying to stock up for winter, they will help you too with some incentive deals.
Speaking of deals, as a member you can also end up seeing many special deals go up at the start of each month.
Personally, I go here for specialized items, select meats, seafood, vegetables (heirloom tomatoes and eggplants in general), nuts, and fruit (particularly Rainier cherries in the mid-summer). Those items are already expensive but it's really untenable to try and shop here for all of your goods (e.g. $8/pound spinach), but it actually has very good select items (including some very rare shaggy mane, matsutake, and lobster mushrooms, as well as large fresh batches of chantrelles and morels when they are available).
Shopping at a farmer's market in Vancouver is no deal when you compare it to any actual market (except maybe Urban Fare or Whole Foods), but for the quality it can't really be beat.