Need rear Lip/valance help

Hey guys i have a 07 mustang 4.0 ...

i upgraded the front bumper to a cobra R bumper from ebay, ive changed the hood to a ram air gt500 style hood, the front of the car looks bad ass!! i also added rear window scoops from a eleanor kit...

soo my front is really low and dirty looking, while the back looks really pathetic with its v6 bumper..

i was looking for lip kits or a bumper i could get, but so far where i looked they are really expensive..

any idea where i can find a nice rear lip or bumper for a good price.. nothing too much..

YOUR HELP IS GREATLY APPRECIATED IN ADVANCE :bigthumbsup