Lanajoy,
She's right different towers are different price ranges and you can have some guests stau at the Comfort Suites nearby and they will gain access to almost everything at Atlantis for free... also some of your guests can stay in Nassau (just over the bridge) for much cheaper if needed. It's not cheap at all but it's a beautiful place. You could always plan a trip for your party to go visit the casino, aquarium and cave together (which are no charge). Going to Atlantis is kinda a must see- most tour guides will take you there anyway Hope this helps - congrats and welcome!