Go to a recycling center and pick it up for free. Roadside signs tht litter the roads are made with the stuff.
You can also go to a sign shop and pay money ( ... but why ? )
Here are some images of my slapped on panels. This is after around 4-6 months of neglect. :
The high drag region where the cat is needs attention.
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The skull&crossbones serve to remind me that there is a gas tank under there !
I used the tanks straps to hold the stuff on so I wouldn't have to drill into the gas tank ( DUH ! )
As you can see, it needs help. Would you believe that is just black duct tape that I used to smooth out that knuckle joint supension thingee ? It still hasn't come off.