Questions on buying older console parts (specifically ps2/xbox)

Hello! I was wondering about where would be a good place to get older console parts, to make a long story short i got this small tv with composite input, and i want to hook up my ps2 to it, but problem: the av cable is missing.

I was wondering were I could possibly buy one online at a cheap price? extra: I also need a power cord for the xbox 360, but the ps2 is my current priority. thank you for your help!