lol i got 2 10" p2's and a 600watt amp and a ported box and all the wires, fuses, ext. for 100$ from good ol craigs list.. granted they only lasted like 4 months before they mysteriously blew at 50% power but still the wires, box, and amp where worth way more than 100$..lol
and i currently only have about 250$-300$ in my system on one of my cars.. got 2 12" comps for 98$(for the pair) at Bestbuy's Black-Friday sale with 2 year no questions asked warranty and spent 125$ on a kicker 300.1 zx and some misc. stuff, and already had a sweet *** Rockford box that's worth like 200$ for free and had the head unit and wires..lol and it somehow is able to hit harder than my buddy's 2 12" cvr's... i guess cus im just good..lol
but my point is, if you do it right you can have a 700$ or 1000$ system for under 400$ or 500$ if you use your head and wait for the right deals and opportunity's..lol