PlayStation Camera not used much at the moment!
I do not know why you tore buy quickly. Simplemet I'll tell you that this accessory is available wherever they sell the console.
Also think the big stores like EB Games, Walt-Mart, Best Buy, Future Shop, etc. .. ...
For now, it is useful for voice commands and connect to the console with the facial recognition.
Over time, I think it will grow, but there is limited.