I didn't know of a flea market, but this is contemporary crafts at their best. If anyone feels like driving out of  NYC!

 Artrider - Spring Crafts at Lyndhurst

The best shopping for Mother's Day in Westchester

• "A very beautiful show in an exceptional setting!"
• One of the best-known, best-attended outdoor arts festivals in the nation
• A New York tradition for 24 years
• More than 300 nationally-acclaimed artists
• Held on the grounds of the gracious Lyndhurst Estate, just 20 miles north of New York City
• Proceeds benefit the National Trust for Historic  Preservation
• A great day for the whole family

Schedule
        Friday, May 2 from 10am to 5pm
        Saturday, May 3 from 10 am to 6 pm
        Sunday, May 4 from 10 am to 5 pm
        Rain or Shine
Admission Fees
       Admission is $10
       Seniors are $9
       Children 6-16 are $4
       Children under 6 are free
       All weekend passes are an additional $3
Parking
       Free onsite parking and look for convenient off-site parking with free shuttle buses directly to ticket booth