My hubby is a Fed. employee, and for years we didn't realize we could get discounts on hotels (duh!) In the past we've gotten the Dolphin for as low as $129. Check the larger hotel chains (non-Disney) for govt. employee discounts, usually you'll get great rates. Two hotels that are part of our summer vacation are a Country Inns and Suites on the drive down to Disney for $60, and after a week in Disney we're staying at the Hilton Oceanfront on Hilton Head in July for $122/night, almost 1/2 off the best rate!
Don't forget I.D., as they usually ask for it...