Yes, in fact, I personally use "www.tripadvisor.com" to find what hotel I should stay at. Tripadvisor.com is a popular website, and the reviews are written by people who have personally stayed at the hotel/rental.
Sanibel Island vacation rentals can be found on the Home Away web site. They have listings for 25 rentals at various rates. You might also write to the Sanibel Island Chamber of Commerce as the chamber usually can provide tourist information for the area.
I'm not sure about the best prices but Ocean's Reach Condominium is supposed to be one of the best resorts on Sanibel Island, they have boats for rental and scuba diving lessons.
I suggest using expedia.com. They are the most consistent site for vacations and always seems to have the best prices. They do have options for Sanibel island vacation rentals.
you can find that list of rentals on angie's list. On that list you will be able to tell if these rental companies are honest and if you will get a good service.
There are plenty of sites with all information on sanibel islands tourism, travel and rentals. some of them are royalshells, flipkey, tripadvisors, and expedia. They offer good discounted rates too.
“WHAT ARE RATES FOR SANIBEL ISLAND HOTELS ”
From the end of the Sanibel Causeway to Blind Pass, Sanibel Island stretches roughly 10.5 miles long.
Florida
The Sanibel Harbour Marriott Resort & Spa is a four star quality hotel located near Sanibel Island. You will enjoy your stay as they take care of your every need.
67 miles
The Keys are 120 miles long. Sanibel Island to Key West is 311 miles.
Fort Myers is approximately 20 miles from Sanibel Island, Florida. The drive typically takes around 30 to 40 minutes, depending on traffic and the route taken. You can reach Sanibel Island via the Sanibel Causeway, which offers scenic views along the way.