the best price I have found is through ticket mania. If you sign up for the mousesavers newsletter, there will be a link in each newsletter to ticketmania to get an even slightly better deal from ticketmania.
Use the search and type "discount tickets". Beside the Mousesavers, which we used and recommend, there are others like Mapleleaftickets, one called orlando tourist, Ithink.
Tax is a MAJOR consideration! Tix from Disney's web site do look cheaper until you go to check out, and then the tax gets added on and significantly increases your total!
Ticketmania and Maple Leaf Tickets include tax in their prices, and for a grand total they are always less than direct from Disney.