Jack Keller Inc. Realtors has been serving the Bay Area and beyond since 1975, active in areas from Pinellas, Pasco, and Hillsborough counties all the way to Miami and Palm Beach Jack Keller Inc. offers flat-fee MLS listing services at a rate of $75 per half-hour, and claims to be able to complete the service for most single-family homes in less than an hour. Jack also works with developers and commercial properties, so you could almost say he's a "Jack of all Trades." The great thing is, it prorates to the nearest minute, so you always get what you pay for.