Ink cartridges are usually accepted back at a retail store (e.g. Staples). Often you will receive a discount on your next ink cartridge purchase. They are also accepted at Ink & Toner Solutions in Northampton: 413-517-0099. There are also various options for sending your cartridges off in the mail to a charitable organization. Below are a few ideas; many others can be found by searching online.
Cartridges for Kids: http://www.cartridgesforkids.com
Recycle4Charity: http://www.recycle4charity.com, 1-800-588-7960
Appears in: What Do I Do With...?