DIN Rail Generic PCB Holder - 50x80mm : ID 4435 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Adjustable Circuit Board Holder Soldering Helping Hand 360 Degrees Rotated For Clamping PCB, Soldering, Desoldering and rework - Amazon.com
KOTTO Third Hand Soldering Tool, PCB Holder Two Magnetic Based Flexible Metal Arms, Helping Hands for Craft Jewelry Solidering Hobby, Helping Station with Anti-Slip Rubber Feet for Weighted Base - Walmart.com