I have seen the the card board "scratchers" at PETsMART, but I couldn't find them on their web site. I found some on the PETCO site.
Look for:
Claw Pals Cat Scratchers
or
Mr. Spats Scratch'r Cizer Pro Model Natural Sisal Scratcher
My mom's cat adores his and one of my fosters used it all the time.
Also, after replying yesterday it occurred to me that perhaps you should try some cat repellant on the carpeting where he's scratching.
Good luck!
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