You can get a good deal on Hotwire. I just plugged in my guess at your dates, found one 3.5 stars in the SeaWorld I-Drive area for $54 per night.
Hotel details
Location: SeaWorld - I-drive South
Star rating: silkHotelStarRating:3.5-star
Check-in date: silkCheckInDate:Sat, Apr 10
Check-out date: silkCheckOutnDate:Sat, Apr 17
Price summary
Hotel rate per night: silkPricePerRoomPerson:$54.00
Nights: silknoOfNights:7
Rooms: silknoOfRooms:1
Subtotal: silksubTotal:$378.00
Tax recovery charges
& fees: silktaxesAndFees:$54.89
Total price: silkgetTotalPriceWithAddOns:$432.89
This hotel features the following amenities:
Fitness Center
Guests have access to exercise equipment; an additional charge may apply. Pool(s)
Property offers at least one pool area; hours and dates of operation may be seasonal. Restaurant(s)
Property offers at least one restaurant on the premises; hours and days of operation may vary. Business Center
Guests have access to business equipment and services; an additional charge may apply. High-speed Internet Access
Guestrooms are equipped with high-speed Internet access; an extra charge may apply. Spa Services
Guests have access to a spa facility or spa services; an extra charge typically applies.
Based on that info, I then went to betterbidding.com and my best guess is this hotel is likely:
3.5* Doubletree Resort International Drive
Amenities: Restaurant, Pool, Fitness, Hi-Speed Internet, Business, Spa
If you are interested in doing Priceline OR Hotwire, do some reading here first. Generally with Hotwire you can figure out which hotel it's most likely to be. With Priceline that's not so easy, but it IS easy to block out undesirable hotels. I've used both many times with much success!
http://www.betterbidding.com/index.php?showforum=14&
Also check VRBO, find an affordable small condo and since you'll be booking somewhat close to the date you're going see if they'll will bargain with you on the price. I just did a quick look and this one seems like it would fit your needs, it would also allow you to do some meals in the condo saving additional money:
http://www.vrbo.com/286077