Fielect 20Pcs 30 x 70 mm Double Sided PCB Board Universal Printed Circuit Proto Board for DIY Soldering Electronic Projects Practice Test Circuit: Amazon.com: Industrial & Scientific
Universal Proto-board PCBs 4cm x 6cm - 3 Pack : ID 4785 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Double Sided 3" x 6" PCB Proto Perf Board, ENIG Perfboard, ST-PERF-3-6 | eBay
Universal Proto-board PCB 6cm x 8cm - 2mm pitch : ID 5588 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits