Below are lists of boats currently for sale on Craigslist.  In addition USODA has a classifieds section where you can find used Optis and gear

Optimist

420′s

Lasers

• wanted: laser rig- mast, boom, hardware etc (NEWPORT, RI) $200
• Laser Pico Sailboat (Portsmouth, RI) $2895
• 2007 Laser XD sail boat (East Greenwich, RI) $4000
• Laser (Newport Rhode Island) $4750
• Laser dolly wanted
• '08 Laser w/trailer - all upgrades- sailed twice! (Bristol, RI) $4300
• Laser sailboat (Bristol) $1200
• 2010 Laser Sailboat (Portsmouth, RI) $4900
• Laser 2 (Warwick, Rhode Island) $2000
• Laser Sailboat