I was going to do an article about Charlie Sheen a few months back, and did some footwork at that time for possible related affiliate ads, so here are a couple suggestions...
(1) related DVDs, as has been mentioned already. Not just 'Two & a Half Men' season DVDs, but other movies he's done (for the hard core Sheen fans).
(2) If you go to his site (charliesheen.com) and click on 'Shop', it links to a dedicated 'Fanfire.com' merchandise page with his official Tshirts.
Charlie Sheen Official Store | Featured Items
Fanfire has an affiliate program at CJ which I assume you can join to earn commissions by linking to his Fanfire page and/or the individual Tshirt pages:
Fanfire - 100% Official Stuff
(3) You can earn commission by selling the shirts his character Charlie Harper wore on 'Two & a Half Men'. What Charlie Harper fan wouldn't want one of those?!
I heard about this through a TMZ article posted after he slammed the "ugly" shirts he had to wear on the show, apparently forgetting that he endorsed and likely makes money from the sale of those shirts.
Article:
Charlie Sheen Shirts -- Company Might Have to Fold | TMZ.com
That shirt line (DaVinci) is sold on Amazon and eBay, which both have commissions programs - although not sure all the eBay shirts are 'official'.
Amazon example:
Amazon.com: CHARLIE SHEEN BISHOP IN NAVY AND LIGHT BLUE: Clothing
eBay search page:
http://stores.ebay.ca/bowling-shirt-closeouts/CHARLIE-SHEEN-DaVinci-Shirts-/_i.html?_fsub=354471219
Hope that helps!