dam thats some cheap shit man.
you can probably get a couple of assassins once they restock, for 160 shipped
you can find a 600 rms amp for about 180 shipped
and build your own box for about 26
thats as cheap as it gets, unless you wanna run a single sub, or get something that sounds like complete ***
but 360, thats like the cheapest for anything remotely good
not to meantion head unit (if you want one), wires, etc