PSP Cameras alternatives

Never had an original camera but since I've just started to use the PSP again I've come across videos of the camera attachment. I wanted to buy one but the prices are outrageous, most are worth more than the console itself.

So is there any alternative? I don't really need an original camera, I just want to be able to take pictures with my PSP. Im not super tech savvy so i wouldn't know if any types of plug in camera or webcam would work. Any help is appreciated