The Union Square Greenmarket has a ton of great booths on Mondays, Wednesdays, Fridays and Saturdays. For a listing of featured booths you can look on this link:
Some great finds are:
Martin’s Pretzels ~Hand rolled hard pretzels and flavored pretzel pieces. They had adorable tins for the Holidays.
The River Garden ~ Cut flowers & wreathes. From Greene County, New York.
Josephine’s Feast ~ Jams, Preserves, Granola and Spice Rubs
James Durr Wholesale Florist ~ Cut flowers. From Chesterfield, NJ.