some laptop CPUs can be upgraded *IF* you are willing to risk taking your notebook completely apart. It's not for the faint of heart.
There are a small number of notebooks that use a MXM module that is a standard form factor for notebook graphics. MXM modules are not exactly readily available, but if you can find one, it should work.
That said, a $200 notebook is not going to have a MXM graphics card. We're talking about $1500+ notebooks that use MXM. Also, MXM tend to be used in desktop replacement notebooks, 17 and 19" screen ones that weigh a lot.