I bought some 3" to 2.5 reducers from Jeg’s. Only sold in paris but I only need one so the other one is for sale. The price for the pair was $21.99+shipping.
Ill let the one I dont need go for $10.00
Click the link for info.
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1313&prmenbr=361