If a person likes PS2 stuff, now would probably be a good time to grab stuff for it. The system has been discontinued for about almost 10 years. From what I've noticed with game systems, is after 10 years, things tend to creep up a bit in price.
*edited to add - I looked it up, and now I see the pS2 wasn't discontinued as early as I thought. Still, the PS3 was introduced in 2006, so that's what I was going off of.