Need Help: Marvin Williams Spx Auto

I pulled this card from the 06/07 Spx when it first came out, and ive held onto it since then as i think its a cool card. Its Marvin Williams SPXcitement Auto Numbered 10/10 and has a nice auto(even though its on sticker).
I cant find the price in Beckett, but if anybody has any idea how much its worth can you please let me know?

Also if there are any Williams fans i might consider selling it, just PM me

WOW!!!. Such a fantastically rare card. I've got high 3 figures ready to go should a rondo ever surface in that release. That is actually the first one i've seen of any player. Isn't priced in Beckett due to scarcity, to the right buyer you should be able to get $100-$200 IMO. On ebay though, i'm not too sure how it would go.