Ebay - you will get a fibreglass replica that you can paint...these are fairly cheap - I got mine £150 delivered plus got a local guy to paint it black.
The good things are these are cheap and enhance the look and I can feel a pull when I am at speed at the front bumper - maybe perception.
Bad things - need to bolt on with 4 strong bolts minimum else it will come off and could cause damage or worse; you will damage it very easily - in the UK they love the speed ramps and steep gradients are used in most car parks so with my lip spoiler and my Eibach springs I am constantly looking for hazards ahead or planning routes to avoid speed ramps. I have a crack I need to fill now and I can see myself getting a new one.
Back to good things - it does really look good