If you have AAA, check with your local office. Mine has the 3- and 5-day hoppers at a discount. A 3-day hopper is $203.30 for an adult and $188.10 for a child. If you want the "Passport Plus" extras (e.g., some shopping discounts, free parking, some DCA preferred show seating), however, it's an extra $13 "processing fee", since apparently they do that through a third-party vendor rather than just in-house.
The best price on 4 day tickets I've found so far is with the Entertainment Book. Even with some pretty hefty "taxes and fees" added on it still comes out cheaper --a 4-day hopper is $224.59 for an adult and $208.74 for a child after all the taxes and fees.
We're going in June, too, but will probably opt for the 4-day non-hoppers. The Entertainment Book cost for those is $211.94 for an adult and $190.64 for a child.