Budget PCs

Where can I look besides like Dell and HP?

My neighbor is looking for a new computer (they’re running Windows 98 right now on an ooold PC). Their budget is 500 - 600, and they need a monitor as well.

I was hoping to find them something with a Core 2 Duo, but I didn’t have any luck at Dell (I was able to configure one, but no monitor included).

Is this feasible now? Or should they go with an AMD/Netburst chip?