Eurocard DIN 41612 Prototyping board PCB FR4 Double sided 100x100mm
Board Connector / Footprint: DIN 41612 2x32pin or 3x32pin 64 / 96 Pin connector. External size: 100x100mm. These are high quality FR4 boards and also most likely cheapest you can buy. Mounting holes: Standard pitch DIN 64612.