Jetsave Travel, at Mana Court, offers accommodation deals and outer island flights.
Island Hopper Vacations, next to the Banana Court in Avarua, and Tipani Tours are similar. These companies also offer transfers, wedding arrangements, and dive packages.
Jeff Hill of Cook Islands Holidays books accommodations, activities, interisland flights, and car rentals.
Be aware that these agents charge commissions as high as 35 percent to the owners and you can often get a better rate by checking the hotel's website and emailing directly.
On the plus side, the companies just mentioned do book the smaller, budget properties travel agents outside the Cooks won't touch because the commissions are so small.