Screen Shot / Celtics.com StoreThe Shaq Store is open for business on Celtics.com.

One of the business benefits in signing a 15-time NBA All-Star and one of most iconic sports names in the world is the merchandising opportunities that come with it.

Less than 24 hours after Shaquille O'Neal's signing became official, the Celtics have added green-themed Shaq merchandise to their online store. The popular jersey T-shirts are priced at $21.95, while replica jerseys are $44.95.

If even just 1/100 of Shaq's 3 million Twitter followers buy a replica jersey this season, that will cover the cost of his $1.4 million contract.

Jermaine O'Neal jerseys are not on sale yet, likely because there's a lingering issue about what number he'll wear. O'Neal stated at his introductory press conference last month that he wanted to wear No. 7. Trouble is, Marquis Daniels, who sports that number last year, re-signed with the team soon after, and would be expected to hold onto that jersey. Then again, Daniels could use a fresh start this season, so maybe he'll work out an agreement to sell that number over to O'Neal before camp starts.

No word on when Semih Erden merchandise will be available.

(h/t: Boston.com)