Here's a handy 3-pack of 5cm x 7cm Proto-board PCBs in green. Both sides have a green silkscreen with some row/column markings. Note that these don't have any traces between the PCB holes, you would normally bend over a thru-hole lead to create connections. They're also good for just plain mechanical work because they are made of strong FR4

There are also four mounting holes so you can attach the PCB to your project box. 

These are affordable and of good quality so we decided to put them in a pack of 3.

Contains 18 X lines by 24 Y lines totaling 432 holes.

We used to stock these in classic black but they've changed to green, we'll try to get black again in the future but for now, this is the only color available.