• http://www.digikey.com (US)
• http://www.onlinecomponents.com (US)
• http://www.buerklin.com (DE)
• rscomponents

• http://www.digikey.com (US)
• http://www.buerklin.com (DE)

• http://www.conrad.de (DE)
• http://www.pce-instruments.com/deutsch/ (DE)
• http://www.pce-instruments.com/english/ (UK)

http://www.robotstore.com – Including numerous kits and a text: “Actuator Design Using Shape Memory Alloys”, as well as off the shelf integrated shape memory alloy actuators (20 cost $80, or 100 cost $300..) These have 20 mm displacement, and one pound pull!