Don't know anything about laptops and there apu's for gaming for under $500?

Thinking about buying another computer to add to the lan so we can have 4 players in minecraft
thing is

#1 i'm on a budget $500 (and i know i can get a desktop that will work fine for this)

#2 there are three pc's here and i don't know if i have the room for another desktop

so i'm looking at laptops

So my question is,
---what will play minecraft on my LAN server for under $500 in canada with decent fps?

Added (1). looking at this one http://www.bestbuy.ca/...4e9763en02

I'm pretty sure that APU's are Graphics processors that are built into CPU's but you probably knew that

I use A thinkpad r60 from 2006 with an ati x1400 gpu and I get full fps on medium settings. These things go for about 150 dollars on ebay I would suggest a used laptop if your only planning on playing minecraft and general use