What he was talking about was the Kicker CompVR Buy1 Get1 free sale going on until June 30th at almost all of Kicker's authorized retailers.
I will assume that you have at least heard of Kicker before?
If not just be aware that Kicker is one of the longest-running and most highly respected brand names in the aftermarket car audio industry. Many world records at various soundoff competitions have been set using their higher-end gear.
The CompVR is one model of subwoofer that they manufacture/sell. If you see CVR in reference to Kicker that's shorthand for CompVR as it is easier/quicker to type out.
In all actuality patrick's suggestion is a really good one. For the novice user the CompVR is a more than capable subwoofer and at the current BOGO (BuyOneGetOne) pricing they are a really hard-to-beat deal for the money.
A pair of CVR 8s would run you $100, a pair of 10s would hit you for $130, a pair of 12s would hit you for $150, and a pair of 15s would hit you for $250.
10s or 12s would likely be your best bet as they wouldn't need near so much space as a pair of 15s and adequate amplification for them would be easier and less expensive to source.
So - let's say you get a pair of CompVR 10s from
www.crutchfield.com.
Those would run you $129.99/shipped for the pair. (call it $130)
That leaves $170 of your $300 budget for an amp.
If you bought the Dual 4 Ohm versions of the CVR then you would want an amp that makes 800-1000w at either 1 Ohm or 4 Ohms.
Something
like this would work just fine and fall within your stated budget. That particular seller on
eBay is one I am personally familiar with and feel safe recommending him to anyone. You pay? He ships. End story. //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif
So now that I have spent your stated $300 budget you could then sell your existing gear to fund either buying or having built a suitable enclosure for the Kickers as well as getting the appropriate wiring to hook it all up!
Certainly that isn't the only path available for getting a decent substage on a budget but it's one of the better ones, in my humble opinion...