I got mine from :
Chrysler Crossfire Windscreen Windblocker Wind Deflector

Base is $88, shipping to UK additional $34
Many additional options.
I got the clear Lexan with rubber surround and clear straps, very satisfied.

Do not buy the storage bag - you will never use it, I leave mine on all the time.

HINT : order 2 sets of straps, with just one, it tends to vibrate and make noise.