JOIN NOW! Use a credit card, check or cash. Choose one of these three options. 1. Fill in the online form below. You’ll be prompted to call the GBA at 413.774.2791 with your credit card information. 2. Print out, fill in and mail in this Membership Form >with your payment to the Greenfield Business Association, 395 Main Street, Greenfield, MA 01301. 3. Print out, fill in and drop off this Membership Form >with your payment to our office at 395 Main Street in Greenfield. About the GBA >GBA Benefits >GBA Board of Directors >