One of the main squares in Maastricht is the "Markt" square, which - shocker - holds a market on Wednesday and Friday mornings. There are a ton of stands, selling all sorts of things, from fresh seafood to flowers, fabrics to spices.
It certainly wasn't the same as the Union Square farmer's market, but it was a lot of fun to wander through and explore. I felt like a real local picking out and trying different dutch cheeses (just like at Murrays!) and taking home a bag of fresh pastries, but my lack of any Dutch language skills and large camera around my neck definitely gave me away. Oh well!